The next time you go online with your gamertag on that console the achievements will upload to Live and your gamercard will be updated on xbox.com The only problem you would have is if you recovered your gamertag on someone elses console - then when you try to go online with your own console it will say the gamertag is invalid. You will need to re-recover it to your console, and will only have the achievements it had when you were at your friends house. Anything you earned since will be lost
If you plan on playing at a friends house use a memory card instead of recovering it since all those offline achievements will be lost if you did so or just make sure to sign in on your xbox to update your gamerscore.
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