100% PC - 51 100% Xbox - 25

20 Minutes Till Dawn (PC)
Assassin's Creed (Xbox)
Assassin's Creed II (Xbox)
Assassin's Creed Origins (PC)
Battlefield Bad Company 2 (Xbox)
Betrayer (PC)
Bit Blaster XL (PC)
Blameless (PC)
Blazing Angels (Xbox)
Boo Men (PC)
Call of Duty 2 (Xbox)
Call of Duty: Modern Warfare (Xbox)
Call of Duty: Modern Warfare 2 (Xbox)
Call to Arms (PC)
Control Ultimate Edition (PC)
Crazy Taxi (PC)
Darksiders (Xbox)
Death From Above (PC)
Death Must Die (PC)
Demonologist (PC)
Diamo XL (PC)
Dragon Age: Origins (Xbox)
Fallout 4 (PC)
Fallout 76 (PC)
Fallout: New Vegas (PC)
Fight Night Round 3 (Xbox)
Firewatch (PC)
Game of Thrones - A Telltale Games Series (PC)
Generation Zero (PC)
Ghostrunner (PC)
Harms Way (Xbox)
Infested Planet (PC)
Kingdoms of Amalur: Reckoning (PC)
King Kong (Xbox)
Mark of the Ninja (PC)
Mass Effect (Xbox)
Mass Effect 2 (Xbox)
Metro: Last Light Redux (PC)
Monday Night Combat (Xbox)
Monsters Loves You! (PC)
Necesse (PC)
Need For Speed Most Wanted (Xbox)
Only If (PC)
Orbt XL (PC)
: PUBG: Battlegrounds (PC)
Prey 2006 (Xbox)
Prey 2017 (PC)
Raft (PC)
realMyst: Masterpiece Edition (PC)
Risk of Rain (PC)
Rocket League (PC)
Savage Lands (PC)
Sid Meier's Civilization: Beyond Earth (PC)
Sid Meier's Civilization: Revolution (Xbox)
Sid Meier's Starships (PC)
South Park Let's Go Tower Defense (Xbox)
Stranded Deep (PC)
Stories Untold (PC)
Super Bit Blaster XL (PC)
Syndicate (Xbox)*
Terraria (PC)
The Elder Scrolls IV Oblivion (Xbox)
The Elder Scrolls V: Skyrim (Xbox)
The Elder Scrolls V: Skyrim (PC)
The Forest (PC)
The Saboteur (Xbox)
The Stanley Parable (PC)
The Turing Test (PC)
The Wolf Among Us (PC)
Tomb Raider (PC)
Tron: Evolution (Xbox)
Turok (PC)
Vampire Survivor (PC)
Wolfenstein: The New Order (PC)
Ultimate Booster Experience (PC)
Xbox LIVE Labs (Xbox)

Link to MetaGamerScore [metagamerscore.com]
*The 51st achievement is not on Xbox 360, only PS3, so it is not listed a 100% on MetaGamerScore