For Gears and Shadowrun I need one more achievement for each. But in Gears I can't seem to really play Annex enough for This! IS! Annex! and I traded in Shadowrun because it got extremely boring.
So far I've done - Viva Pinata, Oblivion, Penny Arcade Eps 1, Lego Star Wars II and Castlevania SotN. Trying to work on Dead Rising, Puzzle Quest and Bioshock.
If you want an easy 200 Achievement points try Golf: Tee It Up! on XBLA. I managed to get all the points by just playing a couple of hours over 3 days. It's a simplistic version of Hot Shots or Mario Golf, pretty fun.
None for me. I'm close to getting everything for COD4 but I haven't racked up the patience for mile high club or finishing the last few missions on veteran yet.