My Achevements are gone!

#1DMCdriverPosted 8/13/2012 1:45:00 AM
I beat this a long time ago, and got all 1000 achevement points. Last week I connected my 360 to the 'net for the first time since I bought it on Launch Day, and after I had to rename my GamerTag (Highway Star was taken), all of the games I had got 1000 on had reset to zero (except Lego Batman).

Has this happened to anyone else and how do I get my Achevements back?
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How to terrify your cow: Tell her that McDonalds has sold about as many hamburgers as there are stars in our Milky Way galaxy- Neil deGrasse Tyson