Acheivement unlocked randomly. Why?

Valentine

New member
I was playing through the story on COD Black Ops when after I finished one of the missions, two achievements pop up, one for completing the story, the other for completing it on hardened or veteran. But I still had two more missions to do before I was done and I was only playing on normal.

I finished the story anyway though, so it's not too big of a problem, but I just wanna know why it could have popped up too early. Any ideas?
 
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