Forum:Achievement Glitch (HELP!!!)

I just finished ME1, with Garrus and Liara. When I got to Ilos and activated the security beacon I got the Completionist and Asari ally achievements. But when I go to check my gamerscore it says I have zero gamescore and I haven't played any games. When I reset the game and tried again the same thing happedned 3 times. Has this happened to anyone and more importantly can you help?