12 is Better Than 6
Age of Gladiators
Alan Wake
Alan Wake's American Nightmare
Anomaly: Warzone Earth (did it all on the hardest possible difficulty)
Banished
Bit Blaster XL
Blood and Bacon
Blue Estate
Brotato (all potatos Danger 5)
Call of Juarez Gunslinger
Cubemen
Dead Island (also maxed all 4 characters)
Dead Pixels
Dear Esther: Landmark Edition
Death in the Water 2
The Deed
The Deed: Dynasty
Deep Rock Galactic
Defend Your Crypt
Defend Your Life
Demolition, Inc.
Depth
Detroit: Become Human
Dino D-Day
Dishonored (probably my 'proudest' 100%, in 69 hours, tests skill and bit of luck)
Dishonored 2
Dishonored: Death of the Outsider
DISTRAINT: Deluxe Edition
Divide By Sheep
DLC Quest
DOOM (2016)
Duke Nukem 3D: Megaton Edition
Dwarfs F2P
Dying Light
Fallout: New Vegas
THE GAME OF LIFE
Grow Home
Hades
Half Dead
Hellblade: Senua's Sacrifice
Her Story
Hidden Folks
iBomber Defense Pacific
Kholat
Killing Floor (doubled the max level exp and requirements on all classes aswell)
L.A. Noire
Left 4 Dead 2 (100%ed it, then years later it got an update, so 100%ed that too)
Life is Strange
Life is Strange: Before the Storm
Mad Max
Maneater
Mark of the Ninja
Mark of the Ninja: Remastered
Marvel's Guardians of the Galaxy
Metro 2033 Redux
Metro: Last Light Redux
Milk inside a bag of milk inside a bag of milk
Montaro
Orcs Must Die!
Orcs Must Die! 2
Orwell
Postal 2
POSTAL: Brain Damaged
Prison Architect
Psychonauts
RAGE
Regions Of Ruin
Reverse Crawl
Robot Roller-Derby Disco Dodgeball
Rock of Ages
Serious Sam 3: BFE
Shadow Warrior
Shadow Warrior Classic Redux
Shoot Many Robots
Slime Rancher
SOMA
Super Bit Blaster XL
Super Sanctum TD
Super Trench Attack!
Terrorhedron
This War of Mine: Final Cut (100%ed it like 3-4 times because of DLCs)
The Darkness II
The Room
The Room Two
The Room Three
The Room 4: Old Sins
The Search
Torchlight II
The Town of Light
Transistor
Ultimate General: Gettysburg
Vampire Survivors
Viscera Cleanup Detail: Shadow Warrior
War in a Box: Paper Tanks
Warhammer: Vermintide 2
What Remains of Edith Finch
The Wolf Among Us
Wolfenstein: The New Order
Wolfenstein: The New Order German Edition
Wolfenstein: The Old Blood
Wolfenstein: The Old Blood German Edition
Yet Another Zombie Defense
Zombie Driver HD
Zombie Kill of the Week - Reborn


Age of Empires II (2013) (DLCs are broken thus achievements are broken)
Dead Island: Epidemic (servers were taken down)
Death Rally (the savegame loses your progress over time, on purpose! lol)
Dungeon Defenders 2 (not technically broken, developer reset my progress somehow though)
Fortified (some broken achievements, what else?)
Hard Reset Redux (savegame got corrupted most likely)
Pinball FX2 (they don't sell the dlc tables anymore)
Revolution Ace (known bug, never fixed https://steamcommunity.com/app/274560/discussions/0/535152511369091248/ )