Achievement Guide and collectible checklist

Achievement guide that can also serve as a collectible checklist

Disclaimer

Just because I'm aware that there are many sites just shamelessly copying content off of steam guides:
Unless you are on steam or on my own, personal, tiny website (that is named after something in biology), be aware that the place you're on shamelessly scrapes steam guides for content. This is not only immoral, but any changes to the guides that might happen later are not updated on where you read this. Be a good person, throw the site you're on in the trash and go to the steam guides.

EDIT: Ah hell, I added this a few minutes after I set the guide life. I should have added it beforehands. gamepro.tips already scraped it without the disclaimer. "Welcome to our guide" they say, while pirating my guide.

Progression Achievements

These are achievements you get automatically by progressing. I will not detail them here as they're better served by a complete walkthrough.

Still got it
Finish the prologue.


Pathfinder
Complete the maze.


Grade B
Collect six unique tokens. Requirenment to complete the game.


Grade A
Collect all twelve tokens.


Grade A+
Collect all tokens and collectibles. See "Collector" for the collectibles

Repetition Achievements

I have the best ideas - Listen to Gabriel’s comments 100 times.
Simply click on things marked with the thought bubble, can be the same spot repeatedly.


Inspector - Zoom in completely 100 times.
Use right mouse button to zoom in a 100 times. Seems only to count if zoomed in completely, button mashing will do no good.

Collector (Part 1)

Collect every collectible. This list was made with the help of a Google Docs document the developer posted in the forums. I fixed some minor mistakes, added some solutions and added item names/descriptions but credit still goes to Crimsonite Games themselves for it.
The original google doc can be found here[docs.google.com].
This can serve as a checklist for the game, I know I used it that way.
The highlight items button, by default left alt, is your best friend for this one. Well it's your best friend for the full game as well.
Split into multiple parts because of steam size limit.

Top Secret Letters
Note: Letters are numbered in the order you find them, the first you find is always Letter #1.

Letter	Location
Secret Letter	Butler's Room, at the bottom of the pavilion
Secret Letter	Amelia's Room, trashcan
Secret Letter	Admiral's Room, among the firewood
Secret Letter	Master Bathroom Toilet, behind the cabinet
Secret Letter	Admiral's room - Obtained by solving the piper mail puzzle. Solution: Both machines have to be set to 50, Butler room has all buttons pressed but top right, Admiral study has all buttons pressed but bottom left

The Art of Gordeaux

Recipe	Location
Art of Gordeaux #1	Chef's room, on top of the Tin can rack, visible from the sides
Art of Gordeaux #2	Kitchen, inside one of the stoves
Art of Gordeaux #3	Secret cabin (garden), in one of the cabbage crates
Art of Gordeaux #4	Basement, near the pumpkin crate, on the shelf under the purple cloth
Art of Gordeaux #5	Shore, in the macaron box - Need a Crowbar from the Chef's room to open it

For whom the bell tolls

Butler Bell	Location
Admiral's Bell	On his balcony, behind the balcony door
Della's Bell	In her bathroom, wall puzzle, press buttons right to lift all obstacles
Bella's Bell	Under the left side of her desk
Amelia's Bell	In the side of the piano in her room. Only visible if both big wheels are set to the bell
Madame's Bell	On the long table in the workshop, behind one of the mannequins

Refined selection of wines

Wine	Location
Wine from 1918	Chef's room, behind the divider, on the white chair
Wine from 1902	Maze Ritual (labyrinth center), bottom of the tree
Wine from 1889	Basement, on a table, reward for solving the pyramid button puzzle (look to the side of the puzzle, compare to the stack of barrels and the symbols on them to your left)
Wine from 1911	Garage, next to the poker table
Wine from 1899	Kitchen, storage, inside the cabinet blocked by the movable sack

Strange Portraits

Ducreaux Picture Title	Location
"I'm talking to you"	In the garage, on the top shelf next to the door leading inside
"How about lowering your voice?"	In the badminton court, under one of the wooden chairs
"I'm shocked and overwhelmed"	Della's room, next to the Ritual wardrobe
"I'm a little less shocked and overwhelmed"	In the Master Bedroom, behind the yellow armchair, in the windowsill
"Keep talking, I'm listening..."	In the Bungalow (labyrinth center), in the cabinet with glass doors, top shelf, left corner

The Voodoo Ritual

Fruit picture	Location
Single round yellow fruit	Gardeners living room, on the bookshelf
Single round red fruit	Gardeners kitchen, on the shelf above the sink
Two round yellow fruits (1)	Gardeners bathroom, upper cabinet
Two round yellow fruits (2)	Gardeners Bedroom, on the dressing drawers
Two round red fruits	Gardeners Bedroom, on the shelf, next to the paper boxes
Two yellow fruits	Gardeners bedroom, on the nightstand
Three round green fruits	Gardeners Secret Cabin, on the table that is in front of the cabbage with a hat
Three red fruits	Gardeners Secret Cabin, at the top shelf of the cabinet
Not picture, Voodoo Doll	Della's bathroom, inside the Ouija Board Box opposite the toilet, opened by the box in the bathtub

My Sweet Collection

Bonbon desciption	Location
Black, round, with star tips and yellow dots	Bungalow (labyrinth center) on the counter next to some berries
Brown square with X on top	Pier near lighthouse, next to the munching seagull in a color coded box - Solution under the dark pink umbrella, black, blue, yellow, red, white, purple, green, orange
White, round with black circles	Lookout table, next to the berries
Black, Elongated	Badminton court Gazebo plate
White, round, black tip and red circles	Bella's room, on the table with the other sweets
White, round, black tip and orange dots on it	Kitchen, at the bottom shelf of the white fridge
Brown, heart-shaped	Salon, at the bottom of the food cart, on a stack of dishes

Sword collection

Sword	Location
Sword #1	Mansion Foyer coat hanger
Sword #2	Mansion Inner Courtyard Balcony, in one of the red flowerpots
Sword #3	Alfonz Secret Cabin table
Sword #4	Garden Excalibur rock
Sword #5	Salon Fireplace

Elegant masks

Mask	Location
Floral, short nose, normal coverage	In the Fashion Show, on one of the mannequins
Floral (and red), long nose, only eye cover	In the Gazebos (Labyrinth center), at the bottom of the center most red column
Floral (white), short nose, full face cover	In the Garden, on the statue next to the garage
Floral, short nose, only eye cover	In the Workshop Balcony, on top of the black lamp
Red (not floral), long nose, only eye cover	In the Basement, one one of the mannequins
Orange (not floral), short nose, normal coverage	In the Workshop, on one of the mannequins on the long table
Pink, short nose, full face cover	It is in the Mask wardrobe in Amelia's room, you can just pick it up
Beige/white, short nose, only eye cover	In the Secret Cabin, on a bookshelf, behind a green cloth

Collector (Part 2)

Part 2 because of steam size limit

Observation diaries

Diary	Location
Diary: HY / TY	Shore, under the starting pier, on the left side
Diary: MZ / X	Garden, under the entrance lion's paw at the mansion entrance
Diary: BA / DE	Garden, at the secret cliff spot not far from the chopped wood shack
Diary: FA / TR	Admiral's Secret Room, behind the curtain
Diary: BT / LR	Lighthouse, in one of the windowsills
Diary: DE / BA	On the sisters' balcony, among the railing, close to where the telescope is.
Diary: RT / XD	Western shore, at the hidden path, after the pier with the pigeon

Spots for True Inspiration
Don't forget to pick up both painting and note

Inspirational Spot	Location
Painting and note #1	Maze, central square
Painting and note #2	On the balcony of the Sisters
Painting and note #3	On the balcony of the Lighthouse
Painting and note #4	Basement
Painting and note #5	Lookout

Spy in the mansion
Both secret folders and keys.

Target	Location Folder	Location Key
Admiral	Garden, under the bench which is opposite the Mansion terrace	Garden, on top of the large swing
Madame	Garden, on a rock, to the left of the Lookout	Garden, in the bird water fountain, left of the mansion entrance
Gardener	Gardener Bathroom, in the bottom left part of the glass cabinet	Gardener WC, in the back of the toilet paper pyramid
Chef	Garden, on the roof of the wood storage shack	Garden, on the tree next to the garage
Amelia	Garage, on a cardboard box, visible from the entrance	Greenhouse, behind the metal saw, in a flowerpot
Butler	Garden,. behind the chives in the vegetable garden	Garden, on a bench next to the fountain

Sketch cards
The card numbers are arbitary

Card number	Location
1	Servant's Quarter Balcony, on the bench, inside the book
2	Bella's bathroom, inside the bathtub
3	Bungalow bookshelf
4	Butler's room, on his desk among the envelopes
5	Della's room, small picture on table
6	Garage, under the car, need to access the barred section first
7	Workshop, on the board with the pictures
8	Chef's room, bottom of the shelf, behind the pavilion, need to move the ladder to access
9	Garden, on one of the benches where the ducks are
10	Salon, Loft, on a table, next to a cup of green tea
11	Servant room with purple walls, at the bottom of the wardrobe
12	Lighthouse balcony, at the bottom of the wall
13	Della's bathroom, under the bell puzzle
14	Island stairs, in the arms of the statue
15	Bella's room, behind the gramophone
16	Workshop Storage, inside the blue handbag
17	Library 1st floor, between books
18	Alfonz Kitchen, in the top cabinet
19	Alfonz bedroom, table with the apple drawings
20	Admiral's Balcony, next to the fruit basket on the small table
21	Garden, in the hand of one of the headless statues
22	In the Foyer, under a stair, need to look up while going out from the library
23	In the Garage, on the table with the cards
24	Amelia's room, inside the telephone drawer

The doors and the plaques
The plaques are always hidden inside the room they're for.

Room	Location inside room
Bungalow (labyrinth center)	Under the gramophone
Admiral's study	On top of a red cabinet
Amelia's room	On the bookshelf next to the balcony door
Bella's room	In the WC, on the top of the cabinet
Butler's room	In the hand of the mannequin
Chef's room	At the top shelf of the wardrobe
Della's room	At the bottom of her WC door
Dining room	At the leg of a radiator
Gardener Bedroom	Behind a flowerpot
Kitchen	On a chair
Library	Ground floor, step on the small ladder, crouch down and look at the side of the bookcase
Salon	In the glass cabinet at the top of the Loft
Servant courtyard	In the corner, behind the entry door, need to close it
Leisure room	Bottom drawer of the wardrobe
Kitchen Storage	At the bottom of a moving ladder - need to move it first
Workshop	Inside a compartment of the sewing machine

Wooden Wheels

Wheel	Location
Broken decorated wheel	In the gardeners bathroom, next to the toilet in the metal basin
Decorated wheel	In the garage, inside the hung up boat
Plain wheel	In the Greenhouse on one of the shelves
Broken plain wheel	In the gardeners bedroom, under the corkboard

Collector (Part 3 - Horseshoes)

Horseshoes
The numbers are arbitrary

Horseshoe	Location
1	Shore, in the shack with the Shell puzzle, hanging from above
2	Labyrinth Part 1, follow the yellow cable, when it turns to the right and you can go to the left continue there, it is on the ground on a black railing
3	Labyrinth Gazebos, under a marble bench
4	Labyrinth Part 2, follow the purple cable, after a big open section it turn to the left, there you continue straight on, the path will turn to the right and then backwards, it is on the side on a black railing
5	Garden, After exiting the maze you can find a wooden archway behind the Plant puzzle with the green needles, go under it and look up
6	Garden, in the little shack with firewood, you can spot if you crouch down
7	Garden, Playground, you need to climb the highest playground object and you can pick it up on one end
8	Alfonz secret house Cabinet (Code clue: The pyramid, «Fuity Note» and depictions on the bookshelfes in the house. Cabbage-Strawberry-Pear-Cherry-Chilli-Apple )
9	Reward for Alfonz secret house Folders
10	Reward for Admiral sword collection
11	Reward for Observation diaries
12	Reward for Observation diaries
13	Reward for Bella Bonbons
14	Reward for Della Ritual
15	Reward for Sketch cards in the Workshop
16	Reward for the scoring all 5 goals in the Garden
17	Reward for Door plaques, in the Servant Storage drawer
18	Reward for Door plaques, Butler's room, desk drawer
19	Stone drawer, unlocked after completing the cleaning task in the servant's courtyard. Code is 6487
20	At the end of the tunnel starting in the cask in the cellar. Lever positions left to right 2-4-5-3-1 to open it
21	Reward for Art of Gordeaux
22	Reward for Wine collection
23	Reward for Mask collection
24	Reward for Strange portraits
25	Reward for Butler bells. The horseshoe is in the entry of the dining room.
26	Reward for TOP SECRET letters
27	Shore, Behind the horseshoe dispenser machine
28	Salon, inside the cupboard, behind the pillow
29	Reward for Inspiration paintings (Horseshoe is at the overlook)
30	Garden, flower garden, hanging in the gazebo

Collection related achievements

By the sword!
Finish the admiral’s sword collection.
The location of the swords can be found under "Sword Collection" in Collector (Part 1). To get the achievement to pop, you have to correctly arrange them in the secret study. Look for white marks on the sword wall and have the tip of the swords point at them

Creative Freedom
Sort out all the creative paintings.
The location of the paintings can be found under "Spots for True Inspiration" in Collector (Part 2). To get the achievement to pop, you have to place each painting in the correct easel. For that, read the notes.
Correct locations are: Labyrinth center: Ship in storm, Cellar: Old man reading the papers, Sisters balcony: Icy tree, Lighthouse: Old man reading a book and finally Overlook: Ducks.
The Horseshoe as a reward is at the overlook easel.

Culinary massacre
Collect all of the the Chef’s special recipes.
The location of the recipes can be found under "The Art of Gordeaux" in Collector (Part 1). To get the achievement to pop, arrange the recipes in the chef's bedroom. Order: 2-5-3-1-4

Start horsing around
Collect all horseshoes.
See Collector (Part 3).

I Spy
Collect all of Amelia's diaries.
The location of the diaries can be found under "Observation diaries" in Collector (Part 2). To get the achievement to pop, solve the puzzle to gain access to Amelia's secrets using the torn notes found in Bella and Della's rooms, then insert the diaries.
The content of the two torn notes in case you can't find them: Dial mask on the table and dress on the balcony, close all doors but the toilet door (this includes bathroom door), close all drawers on makeup table except top left and middle right, open the bottom dresser drawer, open both doors of mask cabinet, open only left door of wardrobe, close every drawer of her desk, close telephone drawer, open piano lid.

Odd wheel out
Assemble Alfonz’s wheel collection.
The location of the wheels can be found under "Wooden wheels" in Collector (Part 2). To get the achievement to pop, arrange the wheels in the gardeners house. Order: fancy, fancy broken, normal, normal broken

Peculiar pictures - Find all the Joseph Ducreux paintings.
The location of the pictures can be found under "Strange portraits" in Collector (Part 1). To get the achievement to pop, arrange the portraits in the master bedroom. Behind the picture places is an outline of the hand.

Premium wines
Assemble the Chef’s wine collection.
The location of the wines can be found under "Refined selection of wines" in Collector (Part 1). To get the achievement to pop, arrange the wines in the basement. Add together the values of the chips. Correct order: 1918 - 1889 - 1911 - 1902 - 1899

Spy Game
Read the TOP SECRET letters.
The location of the letters can be found under "Top secret letters" in Collector (Part 1). To get the achievement to pop, put them all in the drawer in the study. To open the drawer, complete the sign under the sword with the cryptic sign between the lounger and the wall -> "Open sesame". Type that into the typewriter to reveal the key for the top secret drawer next to the sword.

Traitor in the Mansion
Sort out the secret reports.
The location of the folders and the keys can be found under "Spy in the mansion" in Collector (Part 2). To get the achievement to pop, arrange them in the secret cabin. Make a note which key is used to open a drawer and put that folder in the drawer, easier than squinting at the pictures.

You rang M'Lord?
Ring every bell in the game.
The location of the bells can be found under "For whom the bell tolls" in Collector (Part 1).

Croquet time!

Play an unconventional game of croquet.
For this achievement, you must first collect all the croquet heads (3) and croquet doors (4) that are strewn about in the croquet court. They are hard to see, use the "highlight items" button extensively. Then you must hit doors in the color of the doors on the operating table three times for the three sequences. Note one door only counts once, for the longest sequence you need to pass a door twice, it will only count once. You have to start with the shortest sequence and build up, as you don't have enough doors at the start.
The putters will automatically hit the ball if it stops in front of them. The starting machine is always the one at the bottom left if viewed from the table.
Different croquet heads have different strengths. If installed in the first machine, the strengths are: Blue stops just before the first gate, Red stops in the first gate, orange reaches the second machine and purple reaches the third machine.

Solutions:
4-gate-sequence: Install blue gate in "j", purple gate in "f". Install orange head in "M", blue head in "E", red head in "F"
This will open a door on the red putter with a gate and a head.
5-gate-sequence: Install green gate in "j", purple gate in "f", blue gate in "c". Install orange head in "M", blue head in "E", purple head in "F"
This will open a door on the golden putter with two heads.
6-gate-sequence: Install purple gate in "j", yellow gate in "k", red gate in "f", blue gate in "c", green gate in "b". Install purple head in "M", orange head in "D", blue head in "I", red head in "J", purple head in "F"

Working under pressure

Fix the plumbing in the garden.
In The green house, you'll find both a diagram and a "Maintenance note" pinned to it. This is all the information you need, but not all the tools.
You'll need two big metal wheels to fix two disassembled valves. The first one can be found behind the gardeners house. To release it, you'll need the hammer that lies on the garages windowsill, obtainable from the outside. The other big metal wheel is past the excalibur sword and the red way back to the starting shore. You'll need the padlock key, found in the garage above the bikes, to release that one.
Once you have the wheels and the info, let's get to work. According to the maintenance note, D always goes to G no mattes which way you turn it, H needs to be included as it has a filter, A and E are not connected (blocked pipe), F and H are not connected (no pipe at all), A and B are 180° wrong.
Not stated, but A is the source of the water.
This leaves us with this:
The red lines are clogged/non existent pipes. The blue line is what we want.
Set all the wheels according to the blue line, with the building in the middle as a reference point (the half circle is the entrance door, the front of the mansion points rightwards) making sure A and B point opposite where they ought to go, and the achievement will pop.
Facing the mansion, that means A forwards, D any direction, G backwards, C to the left, B backwards, F to the left, E to the left, (still facing mansion but now from behind) H to the left, K to the left.

Dining in

Cook and serve the dinner.
Collect the ingredients for the soup of the decade:
carrots - Gardener living room
Beans, tomato juice - chef's room, in cans
Potato - Basement, on table
Chilled cheese - White fridge in kitchen (open green, red, blue, yellow fridges in order)
Salt - Kitchen storage (locked cabinet, hint is on the wall of the kitchen, around the corner from storage entrance, position the ladders like on the meal menu)
Dice everything on the kitchen counter. Fetch the pan from the counter, fill it with water with the only faucet that can do that (the one below the soup-of-the-decade chalkboard), put it on the stove and start the stove using the button inside the oven. Put all ingredients in, fetch the soup and put it on the dinner table.

Dining out

Solve the picnic mystery.
In the chef's room is a "Knife to meat you" poster. The knifes are numbered, and oh, there are knife boards on the wall with a weird assortment of knifes.
Use those knife boards to get 4 codes of different length. These are: 2897, 11959, 228567 and 2885675.
Out in the garden are 4 picnic baskets which have differing amounts of digits needed to unlock. One is in the gazebo left of the house, one is a bit further where the excalibur sword and red gate to the shore are, one is in the badminton court and the last one is in front of the gardeners house.
Collect the safe knobs from all of them and return to the chefs room. Assemble all the knobs (and the safe handles if you haven't, they're all in the room), then look at the ceiling for the save code. Solution: Middle knob up, then from the top knob counter-clockwise lower left, lower right, upper right, left.

Dress Code

Dress up the mannequins.
There are two mannequins to dress.
One is in the fashion show in the labyrinth center. As this one is a must for progression to the house, I'll skip the description here (in short: dress the mannequin on stage with the hairpin, belt, umbrella and fan that are on the mannequins you can't take them from and on the roof).
The second mannequin is in the workshop.
Gather all the hats you can find (pink one is in the cabinet behind boxes as you enter the workshop, white one is on the chair right next to it, blue one in the briefcase on the long table, purple one in the workshop storage on the windowsill, yellow one right next to it). Gather all the shoes you can find (all in workshop storage, yellow pair in the shelf as you enter, red dead ahead opposite door, black right next to the windowsill where the purple hat was, beige in cabinet below painting and unobtainable blue shoes)
Solve the mirror puzzle boxes in the courtyard and on the workshop balcony to gain two hints and two keys.
Puzzle box solutions:


Use the keys to open the two locked shelves in the workshop.
Dress up the mannequin using the hints from the puzzle boxes (the correct cloth is in the box), high on and on the workshop wall left of it and in the window frame of the workshop storage.
The correct solution is blue hat, purple blouse, checkered orange skirt, beige shoes

Green Thumb

Become a botanical mastermind.
Go to the gardener's bedroom and look at the wall poster to find out about roman numerals: I = 1, V = 5, X = 10, C = 100, D = 500, M = 1000 (and this game's special version, a V with a line over it = 5000). As with real life roman numerals, a smaller numeral in front of a bigger one means the bigger one minus the smaller one. CM is 900 (1000 - 100) while MC is 1100 (1000 + 100), for example.
Other hints are in "Secret Codes 1.0" and "Secret Codes 1.1". Forgot where they are but I think in the gardeners house and garage respectively - write a comment if you know.
From secret codes 1.0, we learn that each column of buttons stands for one digit, top button is 4, middle button is 2, lower button is 1.
From secret codes 1.1, we learn that numbers larger than 7 (1+2+4) are put in by first having all buttons in a column pressed (7) and then pressing the button for 1 or 2 in the next column. So 972 and 7272 and 99 results in the same buttons.
Using this knowledge, go open all 5 plant boxes in the garden. All but one have roman numerals on them, some times quite well hidden, the last one, next to entrance from the labyrinth with a pin on top, has the solution on the tree next to it.
Bring those plants back to the gardeners house and place them on the "scales" in his living rooms to find out what they stand for. Knowing this, read the note you found in the gardeners house, "Gardeners Poem". It tells you how to arrange the plants on the scales. The order, knowing which each plant stands for, is apple, carrot, cabbage, corn, grapes -> plant with small round leaves, plant with big leaves, plant with white flowers, plant with long pointy leaves, plant with red flowers
This will open the compartment, getting you the plant name plaques.
Leave the house and go to the vegetable garden in front of it. 2 plant pots have seed packets on them making it easy for you, the rest you must determine by the text on the plaques.
The correct order for the plaques is, clockwise order from entry door: Basil, Bay Laurel, Chives, (Coriander), Parsley, (Lemon Balm), Oregano, Peppermint, Thyme, Sage

Naval Studies

Find out what the Admiral is hiding.
Find the cryptic sign for the cabinet in the Admiral's study (there are two, one between the shelves which you'll want, one between the lounger and the wall) and install it on the cabinet (-> open project). Type that code (openproject) using the typewriter, revealing the Project: Project wall.
Read the Project: Project signs and then go to answer the three questionnaires, one in the study, one on the study balcony and one in the master bedroom.
The Answers: Project Mars (study): Confectionery, not enough data, false, false. Project Pluto (balcony): Sweets + seeing others in distress, (all 3), (none), Venus + Pluto. Project Venus (master bedroom): 0.026.. hours, false, Venus, (none).
This will cause a direction to highlight on all questionnaires, N for Pluto and Venus, W for Mars. It will also unlock the cabinet where you installed the sign. Open it.
Inside are three busts, labeled Venus, Mars and Pluto. On the cabinet door are also three arrows. All busts have two buttons, one which changes the position and one which turns them.
Have them all in the position of the arrows and facing the direction highlighted on their quiz boards. Which direction is north can be determined by the compass that is in the drawer of the table in the master bedroom.
Solution: North is to the right of the cabinet. Have Venus on the left facing right, have Mars on the right facing away from you, have Pluto on the right facing right.

Part-time butler

Get ready for dinner.
First collect all the ingredients for setting a dinner table: Plates, Napkins and Figurines.
Plates: Green one is on the wagon in dining room, beige one in the kitchen counter opposite the door, red one is above pans on kitchen wall, black one is in the oven, blue one is in kitchen sink.
Figurines: Giraffe is in the middle left drawer of the makeup table in Amelia's room, Unicorn is in Bella's room under the phone, Spider is in Della's room on the purple table, Fox is in the workshop storage at the window, Stag is in master bathroom on the sink.
Napkins: All 5 napkins are strewn about in the butler's room.
Now get the dinner rules from the locked cabinet in the dining room. The code is in the butler's room. 4 numbers on his to do list are circled (6, 7, 8, 9) and the to do list contains a note "rules (arrow up)", so the code is 9876.
The rules determine where each item goes. You can cheat with the figurines if you remember where you found them. If you're anything like me and would have forgotten that if you didn't take notes for a steam guide, don't fret, the dinner rules don't rely on that knowledge.
The correct placement is: Head of the table: Stag, pink napkin, green plate. Right of the table (with a single seat able to set): Giraffe, blue napkin, blue plate. Left of the table bottom (leftmost): Unicorn, green napkin, red plate. Left of the table middle: Fox, red napkin, beige plate. Left of the table top (rightmost): Spider, beige napkin, black plate.

Part-time librarian

Sort out the library.
Collect the chess game notes "Note regarding chess" (on table with chess board), Note about chess (On chair of upper floor), Excerpt from Strange chess rules (in lower library door).
Collect all the 6 chess pieces in the library (and all the 5 books while you're at it), the highlight-items-button is your friend yet again.
Solve the chess board withe Amelia's special rules.
Solution: Top to bottom, left to right: Queen, bishop, knight, pawn, king, rook.
This reveals "A note about chess lectures" in which the admiral tells us he prepared a puzzle wall in which you have to input all possible moves according to Amelia's rules one step further. This is the big checkered wall.
Now, personally I'm still somewhat sure that is not according to the rules, as some seem to need at last two movements because some pieces are set in place in relation to each other and not free to move in a single play, but the correct solution is this:

After this, flip the switch next to the puzzle.
This opens the diagram on the upper floor:

The bookshelves on this are swapped vertically (the upper ones are on the lower floor) but left to right they're accurate. The middle at the bottom looks wrong because the top right in the drawing has a gap and the shelf itself has no gap there - this is probably a bug, it is the middle shelf.
The books you found have numbers on them. The side the numbers are on doesn't matter, all are valid. All but one of the books only have a single place where they could fit according to the diagram, and the remaining one is set because another book with just one possible place takes up one of the two possibilities.
The solution is: Blue 4: Old Christmas. Red 6: Sonnets of three centvries. Yellow 3: The Blue Bird. Red 1: Folk Tales From Many Lands. Green 5: Poems and Songs of Fairyland. Green 2: The Vicar of Wakefield.

The perfect fragerance

Put the perfumes to good use.
First you need all 9 perfumes. They are hidden inside the sisters rooms, many hidden behind small puzzles.
You know from the other achievements that I would detail where to find each - if I noted it down, which I did not. So, well, good luck :D
Once you have all 9, go to the big cabinet in Amelia's room and open it. You're faced with a puzzle and 3 empty perfume spots.
The puzzle needs not much more info, but the perfume spots are determined by the animals in the puzzle and the animals associated with the perfumes (open inventory and look at the perfume bottles, each has an animal printed on it). The order is determined by three hints hidden around the rooms. One, for the first puzzle, is in the top right drawer of Amelia's makeup table, the one for the second puzzle is on the wall to the right of the cabinet, around the corner, the last one is in Della's bathroom, next to the sink.
Once you solve this first puzzle, it will continue in the same vein 2 more times, so allow me to concatenate:
For the first puzzle, you'll need to click bottom left 2 times, top right 2 times, top left one time and bottom left one time. The perfume order is bear - fox - squirrel.
For the second puzzle puzzle, you'll need to click top left 2 times, bottom left one time, top right 2 times, top left one time. The perfume order is eagle - kangaroo - frog.
For the third puzzle, the click puzzle doesn't actually matter, just place the perfumes, but for completeness' sake, you'll need to click bottom right 3 times, top left one time, bottom right one time, top right one time, bottom right one time, top left two times, top right two times, bottom right one time, top left 5 times, top right 2 times and once on bottom right. The perfume order is elephant - crocodile - lion.

Treasure hunting

Find Amelia’s treasure.
Go to Amelia's room and find 3 treasure maps.
The first one is in her wardrobe next to the bed - be sure to also pick up the slab. The second one is in the mask cabinet. The third one is in her secret hiding place, see "I Spy" achievement on how to open it. The only one that matters for the achievement is the third one, but let's be thorough.

All three are digging spots, you need the shovel from the garage for them. The first two will reveal slabs and aren't really necessary for the achievement, they're on weirdly colored ground on the western shore, one about in the middle of the way down to the horseshoe one-armed-bandit, one shortly before the tree outcropping in front of the lighthouse.
The third one, to the right of where you started the whole game (ignoring tutorial) will reveal a huge puzzle box.
This alone unlocks the achievement, but for completeness' sake, let's continue:
First step is the signs on the corners. For each row, one sign will be red and fixed, just turn the rest to fit the first. This will lower the outermost walls. Now you have two walls you can't interact with and two walls opposite them where you can. Turn the symbols on a wall where you can turn and the symbols opposite (that you can't manually interact with) turn as well. Turn each symbol so the opposite wall is all right side up. This will expand the box. Climb on top of it and insert the slabs (one from Amelia's wardrobe, the two you dug up and the one lying to the side of the very console you stand in front of). Turn the knob so it's still on yellow and points to the right, the right side of the puzzle box will light up. Turn each symbol that has an arrow pointed at it. Advance the knob on top one space and turn once and do the same with the side that is now lit up, repeat 2 more times.

[ヴェニアミーン・ラ]

That's right! Those five colored bells at the entrance to the dining room! And that cabinet was always locked. But later I completely forgot about it...
Finally I finished the game with 100% of progress! Thanks a lot!
But now I feel both joy and sadness at the same time...

[Akhlys]

Edited that into the guide now

[Akhlys]

It's in the entry of the dining room. There's a cabinet with bells on top with a drawer that opens when all 5 bells were rang

[ヴェニアミーン・ラ]

Can't find the last horseshoe, but can't clearly understand which one. I think it's the Butler bells' reward, because I don't remember that horseshoe at all. Where is it located?

[ヴェニアミーン・ラ]

Yes, finally found it, on the gazebo's table near berries. Thanks a lot!

[Akhlys]

Most of the stuff escaped my short memory again by now, but I think the lookout was either the gazebo behind the house or the hidden picnic spot also behind the house, far on the right side

[ヴェニアミーン・ラ]

I can't find the last sweet (on the lookout table, next to the berries). Can anyone explain what is "Lookout table"?

[Akhlys]

Thanks, I added that info. Didn't at first because I'm fairly certain you need to open the tunnel for the main game anyway, but hey, doesn't hurt

[[d20]Gresman]

First thanks for the guide.

Second:
For those who are lost on horseshoe #20. The tunnel is behind the large barrel in the basement. For it to open you need to set the taps on the smaller barrels with the lights to the number of lights. There is a note in the chefs room indication the positions of the taps. They are from left to right 2-4-5-3-1. Following that pull the lever next to the staircase and open the tunnel.

Also if you have issues with the game crashing after opening the tunnel do the following. Pull the lever next to the stairs to open the tunnel and go up the stairs. Following that run towards the horseshoe dispenser on the western shore.. There should be a hole in the cliffside now. That is the exit of the tunnel with the horseshoe.

For some reason this avoids crashing the game. At least for me. My best guess is that the crash is caused by the loading of an previously inaccessible area. Or a change on multiple places of the island at once.