I'm trying to 100% beat the story mode of most games in my steam library and earn a majority of the achievements on each game as well. Each game I complete will be listed below.

Games I've finished so far include:

Red Dead Redemption 2 (Epilogue Included)
Uncharted 4: A Thief's End
A Difficult Game About Climbing
Getting Over It with Bennett Foddy
Grand Theft Auto IV: The Complete Edition (TBOGT & TLAD Included)
Grand Theft Auto III - The Definitive Edition
Mafia II (Classic)
Grand Theft Auto V
Grand Theft Auto: San Andreas - The Definitive Edition
Grand Theft Auto: Vice city - The Definitive Edition
Mafia II: Definitive Edition
L.A. Noire (DLC Cases Included)
Stray (100% Achievements)
Max Payne 3
Mafia III: Definitive Edition (DLCs Included)
Mafia: Definitive Edition
I Am Fish (100% Achievements, Bonus Level Included)
Helltaker (100% Achievements, Bonus Chapter Included)
Learn to Fly 3
Need for Speed™ Deluxe Edition
Sleeping Dogs: Definitive Edition (Nightmare in North Point and Year of the Snake Included)
Mirror's Edge Catalyst
Need for Speed™ Heat Deluxe Edition
Red Dead Redemption (Undead Nightmare Included)
Assassin’s Creed IV: Black Flag

Games In Progress:
Just Cause 4