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So for some odd reason this Achievement isn't popping for me. All I had was...sadly, the Prologue. I went through w/ 4 players and finished it and even have verifyied by seeing the 4 player symbol for each chapter. Any idea how to get this to work?
I've got the same problem It's Happening to me too. Just ran through whole game with 4 players start to finish. Must be a bug. I have everything checked in the achievement stats and I rechecked in the campaign menu to make sure I had co-oped everything.
It's done but not unlocked. I wonder what's going on! Help me?
i dont know exactly as some of you are saying that you've just done it complete but when it didn't pop up for me i found that it was an odd chapter that i hadn't finished. I ended up starting it again and playing until it unlocked.