As inspired by http://kotaku.com/numbers/

PC

Bastion
Left 4 Dead
Dinner Date
Noitu Love 2: Devolution
Penny Arcade’s On the Rain-Slick Precipice of Darkness: Episode 3
Dear Esther

360

DOOM (Original 3 episodes)
The Club
Radiant Silvergun
Gwange
Raiden IV
Raiden Fighter Aces
KoF Sky Stage

Wii

Xenoblade Chronicles

PS3

50 Cent: Blood on the Sand
Prince of Persia: Forgotten Sands
Dead to Rights: Retribution
Tekken Tag Tournament 2 (Platinum Trophy)
King of Fighters XIII (Platinum Trophy)
Call of Duty: Black Ops (The first one [Oh Dog, why?])
Sonic Generations
Section 8
Medal of Honor (2010)
Stacking
Borderlands
Ace Combat: Assault Horizon
The Simpsons Arcade Game
Sonic CD
Earthworm Jim HD

3DS

Super Mario Land 3D
Star Fox 64 3D
Dead or Alive: Dimensions (Story mode)
Mighty Switch Force

DS

Golden Sun: Dark Dawn

Vita:

Lumines Supernova (Depending on definition of finishing)
Playstation All-Stars Battle Royal (Platinum Trophy)
Mortal Kombat 9 (Story mode)
Rayman Origins
Really Big Sky Infinity (Again, depending on definition)

PSP

Mimana Iya Chronicle
Gitaroo Man Lives!

Android

Age of Zombies
Caligo Chaser
Cytus

Total: 43

That’s not even one a week ha ha. I must try harder!