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Old 10-03-2012, 09:46 PM   #3
Join Date: May 2010
Posts: 9

Gamertag: finalkaos
Anyone who has this glitch appears to be because a co-op partner has brought a character which will show as a unlocked character, but does not credit towards the achievement.

I started a new game on save slot 2, speed ran the story missions, then just free roamed the hub worlds collecting the characters again, took around 5 hours total but the achievement did unlock when i brought the final character playing solo.
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