It's amazing how the thread divides down those who have few or no completed games. I have a huge backlog of games to play and tend to move on once I've seen the end credits of each one. It takes a special game to convince me to play to 1000GS. Also, as I live in China 10 months of the year, I can't use and don't have XBox Gold membership, so on-line achievements are closed to me making most games inaccessable. I'm also not going to spent tens of hours looking through the world to pick up a 1,000 golden doodads just to get an achievement.
That said, at the moment I have 3 retail and one arcade
Virtua-Fighter
Rayman Origins
Sleeping Dogs
PacMan CE DX
I'm hoping to add Bayonetta to that list by the end of the week. I'm on 880 and just have to complete it on "Non-Stop Climax Mode" (ahem) and find a couple more treasure chests.