Not enough ratings
100% Achievement Guide
By Draco
I was suprised to see that through all these years since this game has been out, no one has made a guide on how to unlock all the achievements.

Soo i decided to make one.

Also, Spoiler alert.
Fired Up
Master the judan stance
Juices Flowing
Master the chudan stance
Rolling Stone
Master the gedan stance
Top Of The Tree
Master the hasso stance
Nerves Of Steel
Master the waki stance
Dance Of Death
Master the stance mastery
Draw To A Close
Master the weapon mastery

All these are straightforward, just spend points on which stance you want to master 5 times.
Once you maxed out, you should get the achievement for the stance you level up.
Personality Traits
Beat the game with grace

Beat the game with brazen

Beat the game with courage

Beat the game with sincerity

Beat the game with cunning

Beat the game with prudence

Traits can be unlocked by which dialogues you pick, bare mind that traits not only influence on your character and run but they also influences the endings as well.
You can also use alterations from the tailor to switch personality at the cost of 10 coins. (You will need to buy the alteration until it unlocks)
Run Achievements
Althought depending on the kind of RNG and traits, these achievements can be unlocked at anytime (or together) during the run.

Bridge enthusiast
Visit three bridges in a single region

Bridges are (for the most part) a crescendo event where you will have to fight multiple opponents, you can sneak on them with the cunning trait or run away from the fight (althought this will give you a "Most dishonorable").
This achievement depends heavily on the map.

Complete five regions without saying "Die"'

Pretty much what it says.
You will most likely unlock this without even going for it.

This achievement unlocks the Benevolent Character

Complete five regions saying "Die." at every opportunity

Basically the opposite of the previous achievement, beware that by abusing the "Die" option, most people in the game will avoid you.

This achievement unlocks the Malevolent character

Meditate under a waterfall with hachimaki and salt

afaik, both of these can only be brought by merchants. Once you get them, just find a waterfall and use the "Meditate" option.

This achievement unlocks the Sorbid Soul character

Change clothing during combat without dying

Just use the "Die" option on a defenseless NPC and change armor or the clothing during the fight.

Drink gaijin sake with gaijin weapon and armor equipped

There's a merchant in the market area that sells Gaijin wares (tought they are quite costly), you only need the items listed in the achievement.

This achievement unlocks the Gaijin character

Forge the legendary sword Masamune

You need to find an NPC in the mountain and ask him to craft/upgrade your sword 6 times.
The options affects only your personality traits.

Have one thousand coins

Keep selling stuff you find from slayed enemies and do some side quest for some NPCs.
You can also sell one of the swords from one of the 7 masters to the sword master for 300 bucks (requires the "prudent" trait).

This achievement unlocks the Looter character

Demonic power
Gain the demon's power

The demon can be found only in the forests, once you get there, accept to kneel.
Then you will need to bring him 8 souls that can be gained by killing unarmed NPCs.

After bringing him the 8 souls, he will give you a boon that will resurrect you once if you die.

Eat 10 pieces of sushi

Sushi can be found all over the map and can be eaten during the non combat interaction.

Drink 10 Jars of sake

Unlike Sushi, Sake is rare to find.

Sake can be found in:
1) In the city, when the game mention a brewery go for it then choose the "Look for something else" dialogue and you will find 3 Jars of Sake. (The other option will only give you 1)
2) In the mountains, when it mentions the Tengu, search for him;
After that always go for the second option until he mentions that he will give you Sake in that case you will have to accept to dance.
3) The Gaijin merchant, should always have at least 1 Jar
4) Can be given by random pesants.

Overall this achievement is heavy RNG dependent.

Righteous Prevail
Defeat a demon

The demon has by far the most OP sword in the entire game, not only by damage but speed as well.
The only way to beat him is to use the Gozen character (which i will explain later on how to unlock) with maxed out Waki (Or Judan).
Another way is to use the monkey charm given by Son Goku (NPC you can find in the woods), you'll have to do first his quest to bring him six sword and a jar of sake.
Boss Fights and Boss Related achievements
This section, has the name ipplies, will focus on the 7 masters, how to beat them and the various achievement related to them.
Quick note that the Masters in this guide will be ranked from easiest to hardest in my opinion.

Tomoe Gozen
Decapitate a boss with a single blow

Your best bet is going to be the Waki master but you can also do it on other bosses as well

This achievement unlocks the Gozen Character

Miyamoto Musashi
Show up late to a duel, then win with a bokken

The duel in question, is the one with the Gedan master.
The cunning trait is mandatory for this achievement

This achievement unlocks the Musashi Character

White Knight
Complete three regions without fighting any women

For starters, The Chudan,Hasso and Sword master are women, meaning that you would want to avoid the region those three rules.

Best way to unlock this achievement would be to avoid fighting at all since some sprites can be misleading.

Complete three regions without fighting any men

The same arguement for the previous achievement applies here as well.
Remember that the Judan,Waki,Gedan and Stance are men.

Defeat the Waki Master

By far the easiest of the bunch, all you need to do is to keep slashing is head. You have around 3 turns before he will (most likely) oneshot you.
This is made even easier with the Gracious/Cunning traits.

Defeat the Hasso Master

The Hasso master is one of the two masters that can be dealt with without the need to kill her, all you need is Sincere/Cunning.
I don't know if it's necessary to kill her to unlock the achievement, but if you're gonna fight her, Either poke her legs and dodge or dodge until she gets exhausted, stab her chest and continue until she dies

Defeat the Judan Master

This is the second master you can spare in your runs, the requirement are Sincere/Prudent/Gracious and a Jar of Sake. (Note that he won't accept the Gaijin sake) also don't pick the "you've had enough" option.
As for beating him, Slash his head off and disegange if you have enough speed,or keep disengaging and slash his head off. (not weaving since it will most likely fail and a single hit from him would mean death)

Defeat the Stance Master

Aside from his boost from answering correctly to his riddle (and even then that's not even a huge buff), use the same Strati used against the Hasso master

Defeat the Gedan Master

As the game suggest, the Gedan master is impantiet.
The best strat is to wait until he starts attacking and either: slash his head off or dodge until exhaustion then attack.

Defeat the Chudan Master

The thing that puts her in this position is her sword which heal her limbs when waiting.
As for beating her, either trades blows with her or outspeed her. Don't bother attacking her arms and legs since she will spend most of the fight waiting.
I would seriously reccomend leaving her for last along side the last master of this list.

Defeat the Weapon Master

As i've mentioned before, she should be dealt for last.
Her gimmick is that she can attack and parry with a high speed bonus after switching weapons. If she equips Ken, she is most likely going to attack.
This boss likes to parry soo the best way to bear is with either high damage to break her parries or yet again, outspeed her.
And for last, this section will focus on ending related achievements

Filthy Casual
Beat the game on easy difficulty

Beat the game on the normal difficulty

Samurai of the legend
Beat the game on the hard difficulty

An easy and guaranteed way to beat this game (yes even on hard) is to:
1) Use the Gozen character.
2) Max out the Waki stance
3) Go to the forest and challenge a demon.
4) Wait a couple of turns than slash his head off.
5) Take his sword.
And after that, nothing can stop you.
Another thing worth mentioning is that this strat can also be done for these next achievements:

True Ronin
Beat the game on hard with no ancestor favor spent

This achievement unlocks the Harrier character

Weapon of choice
Beat the game only changing weapons once

True Pacifist
Beat the game killing only six people

By far the hardest achievement in the entire game, this one is going to take a lot of retries.
For this achievement i would reccomend taking the Sorbid Soul character on easy difficulty with full ancestor points. If you get the starting sequence where your master will commit seppuku, use the "refuse" option and the first dialogue option after that.
Level up Judan first and then speed.
Start off with the Hasso master, this is one will require the Cunning and Prudent trait (neutral is also good since it will give you access to both options) but do not overdo the cunning trait since you will need to switch to sincere during the Judan master (as well as level up the Prudent and Gracious trait).
If you managed to get a Jar of Sake, go the Judan master (remember that he won't accept the Gaijin Sake and you need to not click that "you've had enough" dialogue), if not, go to the Waki master since he's the easiest.
If you managed, to spare both masters and got to the emperor, you'ill only need to kills his ward.
A tip for avoiding the bandits (who are the biggest obstacle for this achievement): they travel to right to left and then return to the right, make sure you either reach the dojo master before they reach the left side, or make sure to have an alternative path to avoid spawning in front you.
This pretty much boils down on the map layot.

See every ending

As stated before, personality traits influence on the type of ending you can get.
I won't be going in full detail on how to get all the endings, but i will point the kind of endings you can get:

Seppuku (multiple variants
Wandering (Emperor either dead or alive)
Settle Down
Exiled Emperor
Closing Remarks
This was my first serious guide, i apologize if it may not be the most instructive or the most well written guide avaible for this game.

Let me know in the comments if i made any mistakes.