Looking for a co-op partner for the last two levels of Level 5 in hard mode.
The rest of the levels are easy enough to do in single player on hard mode. Message me if you want to get these hardest two levels completed.
Post a message in this forum or
Send me a message on XBOX LIVE --> HERE
Send me a message directly to my Website's Email --> HERE
EDIT: I now have the achievement. I completed the final boss in single player.