can't re-earn halo aniversary achievements

I am having a huge problem. I earn a few achievements in Halo Anniversary but by the second time I got an error message “Failed to save content” So I deleted my profile and re-downloaded it but once I the achievements I first unlocked weren’t there. I tried to earn them again but nothing popped up. One achievement is Halo: complete the level on any difficulty. I did this on normal then I re-did it on Heroic. I beat it but no achievement. PLEASE HELP!!!

Delete your save file, it’s corrupted. I had the same problem with Dead Rising and Gears of War