Ive beaten the last level about 5 times now and it wont unlock. My completion Stats say 19/19 completed on Super Soldier. Has this happened to anyone else? I'd like my achievment please.

This happened to me to. Haven't heard about any fix yet. The only thing I can think of at this point is deleting your save file and starting a new game on Supersoldier. I did delete my save file, but haven't started a new game yet. I heard it unlocked for people the second time (or sometimes the 3rd or 4th time...) but I can't confirm that this works. I hope they will fix it soon.