THE ACHIEVEMENTS DO NOT UNLOCK! HELP!!!

THE ACHIEVEMENTS DO NOT UNLOCK. I PASS ALL THE CAMPAIGN IN HALO 2 ANIV. AND NOT GIVE ME THE ACHIEVEMENTS.
I NEED HELP. CAN SOMEONE GIVE ME A SOLUTION FOR THIS PROBLEM. THANK YOU.
GT: Xxx Ivan xxXD

This is a known problem and 343 has done jack -Yoink- to fix it, no use coming here and asking for help.