I have no idea how many games I have completed over the years...I'm 25 thats a quarter of a century, most of it spent with a game controller or a pc mouse and keyboard in front of me? You honestly expect me to remember them all? It's easier for me to list the games I have at present I've not completed:

GTA IV
Red Dead Redemption
Fallout 3
Dead Rising
Dynasty Warriors Gundamn
Final Fantasy Tactics A2
Pokemon Diamond
Pokemon Heart Gold
Starcraft 2
Advance Wars Dark Conflict