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 (139/161 games complete w/ DLC (Most Recent: Fez)
Halo Fanatic: All Gamerscore (Including DLC) in Halo CEA, 2, 3, 4, ODST, Reach, and Spartan Assault (360, X1, and W8) Just gotta finish Halo Wars and get SA for WP8!