This is a list of games that I have completed all of the achievements, and acquired 100% on, and the date of that 100%

Disclaimer: This is when I first achieved 100% on the game, further achievement updates or additions (including re-acquiring 100%, the only game I haven't actually re-completed is Unturned) are not included in here.

Notes:

My perfect game count is off, as some games were removed after I acquired 100%:
- The Answer is 42
- Aurora Nights
- Numberline
- Qubburo 2
- Woodle Tree Adventures

My achievement milestones are off as CS:GO had 167 achievements removed, all milestones (past and present) are calculated with these 167 added on.

Perfect Game List:

#1 - Papers, Please: December 29th, 2014
Portal: January 24th, 2015
Portal 2: February 13th, 2015
Sparkle 2 Evo: February 22nd, 2015
#5 - Lucius: March 13th, 2015
Defy Gravity: April 13th, 2015
Morphopolis: April 28th, 2015
Oozi: Earth Adventure: May 14th, 2015
Skyrim: May 27th, 2015
#10 - Out There Somewhere: May 30th, 2015
Unturned: July 28th, 2015
LYNE: August 7th, 2015
Hexcells: August 7th, 2015
Hexcells Plus: August 16th, 2015
Rocket League: August 22nd, 2015
Hexcells Infinite: August 24th, 2015
Pool Nation: September 16th, 2015
Sumo Revise: November 22nd, 2015
Vertiginous Golf: December 12th, 2015
#20 - Woodle Tree Adventures: December 19th, 2015
Hook: December 26th, 2015
Robot Roller-Derby Disco Dodgeball: June 29th, 2016
LIMBO: July 3rd, 2016
To The Moon: July 16th, 2016
EVGA PrecisionX 16: July 21st, 2016
Race The Sun: July 23rd, 2016
Wave Mechanics: August 1st, 2016
Two Digits: August 4th, 2016
Tenrow: December 24th, 2016
#30 - Pythagoria: June 28th, 2017
Unium: July 8th, 2017
Knights: July 16th, 2017
Tabletop Simulator: September 1st, 2017
Numberline: November 9th, 2017
Three Digits: December 14th, 2017
WayOut: December 19th, 2017
Cross Set: December 24th, 2017
Chip's Challenge: January 20th, 2018
PEG: June 17th, 2018
#40 - Garry's Mod: August 2nd, 2018
klocki: November 1st, 2019
Cross Set Infinity: November 11th, 2019
Chip's Challenge 2: April 23rd, 2020
Pictopix: September 10th, 2020
Sudoku Universe: September 12th, 2020
Nonogram - The Greatest Painter: September 23rd, 2020
Crosscells: September 24th, 2020
Delete: September 24th, 2020
Lineway: September 24th, 2020
#50 - Qubburo 2: September 25th, 2020
Zenge: September 28th, 2020
Counter-Strike: Global Offensive: November 5th, 2020
SiNKR: November 10th, 2020
Aurora Nights: November 11th, 2020
PUSH: November 12th, 2020
WayOut 2: Hex: November 21st, 2020
The Room: November 22nd, 2020
The Room 2: November 29th, 2020
The Room 3: December 6th, 2020
#60 - Golf With Your Friends: March 4th, 2021
Refunct: March 7th, 2021
The Answer is 42: September 26th, 2021
The Room 4: Old Sins: January 11th, 2022
A Bird Story: January 12th, 2022
Tametsi: February 7th, 2022
Unlock The King: March 4th, 2023
Sinkr 2: September 23rd, 2024

Achievement Milestones:

1: Suddenly The Dungeon Collapses (Dungeons Of Dredmor)
100: Pturretdactyl (Portal 2)
200: Oops! (Lucius)
300: With Friends Like These… (Skyrim)
400: Have a plan to kill everyone you meet (Out There Somewhere)
500: World 6 (Hexcells)
600: Miniputt Course -20 (Vertiginous Golf)
700: How Stuff Works (Guns Of Icarus)
800: Falcon (Race The Sun)
900: On The Rocks (Chip's Challenge)
1000: Cupid's Arrow (Knights Of The Old Republic 2)
1100: Г (WayOut)
1200: Complete Finisher (Chips' Challenge)
1300: 10 x 10 (Pictopix)
1400: ∞25 (Sudoku Universe)
1500: Nuke Map Veteran (Counter-Strike: Global Offensive)
1600: Kill of the Century (Counter-Strike: Global Offensive)
1700: Fly, fly away! (Golf With Your Friends)
1800: Logician (Tametsi)