100% games

The Amazing Spider-Man
Bastion
Batman Arkham Asylum GOTY
Brothers - A Tale of Two Sons
Castle of Illusion
Costume Quest
Darkness II
Darksiders
Deathspank
Dust: An Elysian Tail
Free To Play
Half-Life 2
Half-Life 2: Episode One
Half-Life 2: Episode Two
Hitman Absolution
Indie Game: The Movie
Just Cause 2
Lara Croft and the Guardian of Light
Mark of the Ninja
Middle-earth: Shadow of Mordor
Portal
Prototype 2
Psychonauts
Puzzle Agent 2
Saints Row IV
Saints Row: Gat out of Hell
Sequence
The Shivah
Shank
Shoot Many Robots
Sleeping Dogs + Nightmare in North Point + Year of the Snake
Sniper Elite: Nazi Zombie Army 2
Sonic Generations
Spectraball
Stacking
SteamWorld Dig
The Swapper
Thomas Was Alone
To The Moon
Trine
Trine 2
The Walking Dead + 400 Days
Wasteland Angel
Zack Zero

Almost.. but one away
Braid
Nimbus
Marlow Briggs
Saints Row: The Third (co-op cheeves)

TF2B Backpack [backpack.tf]