100% Achievements are marked with 💯. If a game has another 100% that isn't 'cheevo based or non-steam 100% it will have a ⭐. First ~160 are unorganised, then there is a break where they properly become ordered by finish time.
Completed either means the obvious Campaign finishes, but also includes Progression finishes or Achievement finishes for games with no campaign.
Gunpoint 💯
Expendabros
Assassin's Creed 3
Assassin's Creed 4 Black Flag
Assassin's Creed Freedom Cry ⭐
Far Cry 3 Blood Dragon ⭐
Just Cause 2
The Plan 💯
Grow Home
Payday The Heist
Hitman: Sniper Challenge
Retro City Rampage DX
Saints Row 2
Watch_Dogs
Antichamber
Far Cry 3
Mark of the Ninja
Viscera Cleanup Detail: Shadow Warrior
Hitman: Blood Money
Sniper Elite V2
Hook 💯
Watch_Dogs 2
Jazzpunk 💯
Assassin's Creed Syndicate
The Silent Age 💯
Spec Ops: The Line
Wolfenstein: The New Order
Swiftly 💯
Tom Clancy's Ghost Recon® Wildlands
Roundabout
Mr.President! 💯
Just Cause 3 💯
Wolfenstein: The Old Blood
SimplePlanes
Guts and Glory
Far Cry 4
The Last Photon
SUPERHOT
Oik 2 💯
Oik 💯
Oik 3
Max Payne 3
Guns, Gore and Cannoli 2 💯
Ronin 💯
Mr. Shifty
Small Radios Big Televisions 💯
Westerado: Double Barreled
Slavistan
Orbt XL 💯
Firewatch 💯
Kane & Lynch 2: Dog Days
Quantum Break 💯
SPACEPLAN
Saints Row: The Third 💯
Passpartout: The Starving Artist
HITMAN 💯
Safety First!
L.A. Noire
Human Fall Flat
Mirror's Edge
Donut County
Far Cry 5
Punch Club
Mafia
The Stanley Parable 💯
Dishonored 2
The Hong Kong Massacre
Just Cause 4 Reloaded
METAL GEAR SOLID V: THE PHANTOM PAIN
Panzermadels: Tank Dating Simulator
Hotline Miami 💯
Hitman: Absolution 💯⭐
Receiver
Saints Row IV: Re-Elected
FEZ
Pikuniku
OmniBus
The Witness 💯
Highway Blossoms
Portal 2
SUPERHOT: MIND CONTROL DELETE 💯
Mafia II (Classic)
Tails Noir: Prologue
Call of Juarez: Gunslinger
NOT A HERO
Wolfenstein II: The New Colossus
DEADBOLT
Mafia III: Definitive Edition 💯
INSIDE 💯
Jalopy
Mirror's Edge Catalyst
Mafia: Definitive Edition 💯
Sleeping Dogs: Definitive Edition
Noita
Sniper Ghost Warrior Contracts
Serial Cleaner
Hotline Miami 2: Wrong Number
Katana ZERO
LIMBO 💯
John Wick Hex
GARAGE: Bad Trip
Morkredd
Minoria
In Other Waters
Control Ultimate Edition
Wildfire
Cyberpunk 2077
Paint the Town Red
Surgeon Simulator
Terraria
Road to Ballhalla
Death Squared
Golf Club Nostalgia
The Crew
Dead Rising 2
Barotrauma
Dead Rising 3 Apocalypse Edition
Omegalodon
Cookie Clicker 💯
Wreckfest 💯
Grand Theft Auto V
PAYDAY 2
Steam Engine Simulator 💯
Remnant: From the Ashes
Brick Rigs
Broforce 💯
Sniper Elite 5
Sniper Elite 4
Crush Crush 💯
Sons Of The Forest
We Were Here 💯
BeamNG.drive 💯
Dying Light
Tametsi 💯
Taiji 💯
Heat Signature 💯
SAMOLIOTIK 💯
DLC Quest
Besiege
PUBG: BATTLEGROUNDS 💯
INK
Block'hood
Little Inferno
HITMAN 2
HITMAN 3
METAL GEAR SOLID V: GROUND ZEROES
Counter-Strike Global Offensive 💯
Counter-Strike 2 💯
Portal Stories: Mel 💯
Mad Max
Dr. Langeskov, The Tiger, and The Terribly Cursed Emerald: A Whirlwind Heist 💯
Human Resource Machine 💯
7 Billion Humans 💯
Battlefield V
Battlefield 1
Call of Duty: Modern Warfare II (2022)
Tom Clancy's Splinter Cell Blacklist
A Way Out ⭐
Need for Speed: Most Wanted
Manhunt 2
Superliminal
Forza Horizon 4
Forza Horizon 5
Crashtastic


Here's where I started counting, from here order is correct.
Fights in Tight Spaces
Lara Croft GO 💯
Hitman GO: Definitive Edition 💯
Patrick's Parabox 💯
Earn to Die 2 💯
Time Loader 💯
The Masterplan 💯
Portal 💯
Heave Ho
The Final Station
The Bradwell Conspiracy
Portal Reloaded
Portal: Revolution 💯
Aperture Desk Job
Hitman: Codename 47
20 Small Mazes 💯
Hitman 2: Silent Assassin
shapez 💯
Deepest Sword 💯
People Playground 💯
Pocket Waifu: Desktop Pet 💯
Grounded

I got some games
-------Humble
Carnival Games VR
Civilization III
The Darkness II
Clustertruck
The Final Station
Party Hard
Punch Club
SpeedRunners
Streets of Rogue
ENSLAVED™: Odyssey to the West™ Premium Edition
Just Deserts
Sunrider Academy
Sunrider: Liberation Day - Captain's Edition
Sunrider: Liberation Day - Theme Song
8-bit Armies
Gloria Victis
Panzer Corps Allied Corps DLC
Fault milestone one
Fault milestone two side:above
Killing Floor
Punch Club
Pony Island
Wasted
Clustertruck
No Time To Explain Remastered
Party Hard
SpeedRunners
Gods Will Be Watching
Galactic Civilizations Ultimate Edition
Aurion: Legacy of the Kori-Odan
The Interactive Adventures of Dog Mendonça & Pizzaboy
Jotun
The Journey Down 1 + 2 Bundle
Legends of Eisenwald
Turmoil
Valhalla Hills
Void Destroyer
Warhammer: End Times - Vermintide
Aurion: Legacy of the Kori-Odan
The Interactive Adventures of Dog Mendonça & Pizzaboy
Jotun
The Journey Down 1 + 2 Bundle
Legends of Eisenwald
Turmoil
Valhalla Hills
Void Destroyer
Warhammer: End Times - Vermintide
Turmoil
Awesomenauts
Stick Fight: The Game
Boomerang Fu
Wytchwood
DESTROYER: THE U-BOAT HUNTER
High On Life
Astral Ascent
Diluvian Ultra
The Darkside Detective
The Darkside Detective: A Fumble In The Dark
Resident Evil Revelations 2 - Episode 1: Penal Colony
Resident Evil
Resident Evil Revelations
Resident Evil 6 Complete
Resident Evil 5 Gold Edition
Resident Evil 4 (2005)
Resident Evil Revelations 2 / Biohazard Revelations 2 Deluxe Edition
-------Fanatical
Party Hard
Surgeon Simulator - Anniversary Edition
FlatOut
Alien Rage - Unlimited
Nam
POSTAL 2
Lovely Planet
Thea: The Awakening
Eastside Hockey Manager
Valthirian Arc: Hero School Story
Arcade Spirits
Helheim Hassle
Monsters' Den Chronicles
Double
The Deed: Dynasty
Animal Rescuer
Just Ignore Them
The Innsmouth Case
Praetorians
Painkiller Hell & Damnation
Shadows: Awakening
Mystery of Unicorn Castle: The Beastmaster
Guild of Darksteel
StrikeForce Kitty
Geometric Sniper - Blood in Paris
Dust Fleet
Telepath Tactics Liberated
STASIS
SUPER CRAZY RHYTHM CASTLE
Pumped BMX Pro
Dungeons 2
-------Loose
12 is Better Than 6
12 is Better Than 6
Dishonored
Golf Gang
DOOM II
DOOM II
DOOM II
DOOM 64
Anomaly Defenders
I am not a Monster: First Contact
Battlestar Galactica Deadlock
Hero of the Kingdom
Hero of the Kingdom: The Lost Tales 2
Achtung! Cthulhu Tactics
SEUM: Speedrunners from Hell
SEUM: Speedrunners from Hell
Xpand Rally
Dust to the End
Scheming Through The Zombie Apocalypse: The Beginning
Kingdom Rush Frontiers
Pure Farming 2018
Just Ignore Them
Call of Juarez
Grey Goo Definitive Edition
XLarn
Among the Sleep
Blade Assault
Yooka-Laylee
Caveblazers
Roadwarden
Risk of Rain 2