HELP!!! i just beat halo 3 campaign on legendary and it didnt give me my...

[velcrosoup13]

...achievements for beating it? WTF, i am really ****ed off, what the hell should i do.
i started it from beginning, i gues i can try to go through again and not skip videos

 

[Harley]

Trying to be as helpful as possible without owning the game and not having a chance to have played it while they had it playing in video game stores and what not but do you think it could be a glitch?

 

[solid snake]

Did you start it from the very begining? Dont skip any videos. That hapend to me and I beat it again( which made me verey mad) and I got the achievment.

 

[kyle s]

Well if A) somebody already beat it on your id then you wouldn't get the achievment or B) You skipped a part and you need to finish that part.
But otherwise congratz on beating it =)