Just wanted to add that the achievement's, for me anyway's, are glitched. I'm having problems with the shooting 50 objects from the helicopter achievement. I even did it on easy and never died the whole way through, and still never got it. Also, I need one level left for co-op, Level 7, I've done it like three times now on easy and hard and still nothing. Also, I had the clear all levels on hard achievement pop up when I still had 2 levels left to do. Just thought I would add this. By the way, If I start a new game and delete all my saves and just do level 7 in co-op, do you think that will work?? Thanks guys.