So I found this while playing Dance Central, if you get an achievement then everyone else that is logged onto the console at that current point will also get the achievements(s). I was told it did this when someone was playing adventures (i think) but I know for sure that it does it on Dance Central. So if you don't want to play any Kinect games but someone in your house will on their Gamertag, just log on while they play and you will both get the achievements regardless of you ever playing the game.
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100% Retail Complete(21):
COD-MW2, Lost Via Domus, L4D, Madden 06, COD-WaW, Resident Evil 5, CSI Hard Evidence, EA Sports FN 3, NBA 2K6, TMNT, COD 2, King Kong, Avatar: Burning Earth, Fallout 3 (360), Rainbow 6 Vegas, Night at the Museum 2, Shell Shock 2, College Hoops 2k6, Cloudy with a Chance of Meatballs, Backyard Football 10', PoC at Worlds End