I'm an avid gamer and like to play games 100% whenever possible. So below is a list of the games I've completed in their entirety, excluding multiplayer achievements.

A Story About My Uncle (14,7) — 15/15
Airstrike HD (2,4 (mb more)) — 12/12
Among Us (58,5) — 33/33
Assassin's Creed (19,3) — 100% (screenshot)
Assassin's Creed Brotherhood (69,8) — 100% (except MP)
Assassin's Creed II (41,9) — 100%
Assassin's Creed Revelations (51,2) — 100% (except MP)
Bridge Constructor Portal (36,4) — 26/26
Collapse (9,7) — 100%
Counter-Strike (575,1) — ❌❌❌
Counter-Strike: Condition Zero (0,5) — ❌❌❌
Counter-Strike: Condition Zero Deleted Scenes (7,6) — 100%
Counter-Strike: Global Offensive (985) — 167/167
Cyrano Story (2,7) — 13/13
Deadpool (15,2) — 50/50
Deiland (16,3) — 24/24
Dishonored RHCP (124) — 80/80
Dota 2 (6462,6) — ❌❌❌
Draw Slasher (23,2) — 13/13
Fable Anniversary (42,8) — 50/50
Far Cry (24,7) — 100%
Far Cry® 3 (65,6) — 100% (except MP)
Half-life (12,2) — ❌❌❌
Half-life Deathmatch: Source (0,9) — ❌❌❌
Half-life: Blue Shift (3,1) — ❌❌❌
Half-life: Opposing Force (6,9) — ❌❌❌
Half-life: Source (7,6) — ❌❌❌
Just Cause (59,1) — 100% (screenshots)
KHOLAT (9,7) — 20/20
Lara Croft GO (17,7) — 17/17
LEGO® Star Wars™: The Complete Saga (76,4) — 100% (screenshot)
LIMBO (13,2) — 13/13
Machinarium (6,1) — 12/12
Mafia (64,1) — 100% (screenshots)
Magazine Editor (1,8) — 10/10
MURDERED: SOUL SUSPECT™ (24,5) — 48/48
Of Orcs And Men (27,8) — 45/45
Outlast (35,8) — 14/14
Polarity (6,8) — 10/10
Portal (11,5) — 15/15
Prince of Persia (2008) (26,5) — 100%
Prototype (43) — 100% (screenshots)
PROTOTYPE 2 (54,1) — 43/43
Renegade Ops (10,7) — 16/16
Rogue Trooper (20,9) — 100%
Runaway: A Road Adventure (12,3) — ❌❌❌
Runaway: A Twist of Fate (6,9) — ❌❌❌
Runaway: The Dream of the Turtle (25,6) — ❌❌❌
S.T.A.L.K.E.R.: Shadow of Chernobyl (65,7) — 100%
S.T.A.L.K.E.R.: Clear Sky (76) — 100%
Serial Cleaner (10,1) — 28/28
Sex with the Devil (3) — 4/4
Sniper Art of Victory (4,4) — 100%
Sniper: Ghost Warrior (17,4) — 19/24 (except MP)
STAR WARS™ Episode I Racer (3,4) — 100%
STAR WARS™ Jedi Knight II: Jedi Outcast™ (16,3) — 100%
STAR WARS™ Jedi Knight: Dark Forces II (34,7) — 100% (screenshot)
STAR WARS™ Jedi Knight: Mysteries of the Sith™ (23,4) — 100%
STAR WARS™ Knights of the Old Republic™ (58,8) — 100%
STAR WARS™ Republic Commando (8,4) — ❌❌❌
STAR WARS™: Dark Forces (18,2) — 100%
STAR WARS™: Shadows of the Empire (30,6) — 100%
STAR WARS™: The Clone Wars - Republic Heroes™ (43,8) — 100% (screenshot)
STAR WARS™: The Force Unleashed™ II (18,1) — 100% (screenshot)
STAR WARS™: The Force Unleashed™ Ultimate Sith Edition (22,7) — 100%
Stronghold Crusader Extreme HD (10,8) — 100%
Stronghold Crusader HD (85) — 100%
Stronghold HD (26,4) — 100%
Team Fortress Classic (1,2) — ❌❌❌
The Deed (2,3) — 17/17
The Search (1) — 9/9
The Tiny Bang Story (10,3) — 100%
The Witcher: Enhanced Edition Director's Cut (78,6) — 100%
Thief (78,3) — 37/37
Tomb Raider I (24,6) — 100%
Triangle (3,5) — 100%
Vampire Survivors (132,9) — 190/190
Weapons Genius (2) — 9/9