Did you have anything in mind? And do the matches we play necessarily need to pertain to boosting or can we just go play some Call of Duty, etc. I'm assuming the former. Regardless, anything on your list, or is there anything you have that you still need achievements for online? I own and still need things from Prey, Modern Warfare 3, Gears of War 2 (horde). Do we overlap on those at all?
Edit: Looking at you gamer card, you don't really need anything from Prey, and definitely not Gears 2. However, it looks like MW3 is perfect, if you still have it, that is.