Anyone know how I get achievements racked up on a friends system?
if you used your gamertag, you already did
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Connect the console which the achievements were gained on to the Internet and sign into LIVE with your profile.
[quote user="Silent Paradigm"]
[/quote]This is what you do if you have unlocked the achievements offline. Though if that's the case, if you've recovered your gamertag on a different HDD/console, they'll be gone.