Forum:I need help! Call of Duty Black Ops Problems

Well, I haven't finished Black Ops's campaign yet, and have only accessed the secret terminal for Zork and DOA, but it says I have all intel, all levels in campaign, "Five" and anything else. I didn't care that much at first, because I didn't care about finding intel, and didn't care if my achievement would be wrecked, and I could still play through the campaign like normal. I did care when I did the level with the Ascension group on Recruit and unlocked 3 achievements: The achievement for completing the level, the achievement for completing the level on VETERAN, and the achievement for beating the campaign. I really want to fix this because I don't want to get achievements I don't deserve. I tried deleting my save, and even Zork's save, and it's still stuck that way. It's only with my profile, I checked with my younger sister's profile and she didn't have everything like I did.

Please help!

If I'm stuck with this I'm going to have to play through on Veteran so that those achievements would of really been "achieved" and I HATE Veteran difficulty (I like to be challenged by games I play, but Veteran/Legendary is WAY too much challenge for me, and it removes all the fun)