I have a TA session for trading the Quad Bike kill achievement. It's the only achievement we're getting so it should only take like 20 minutes, check it out, thanks!
Winding down the achievement hunting...
95%+ Completion (142/164 games complete w/ DLC (Most Recent: Trials Fusion for the 360)
Halo Fanatic: All Gamerscore (Including DLC) in Halo CEA, 2, 3, 4, ODST, Reach, and Spartan Assault (360, X1, and W8)