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Putting it Scientifically…

Story Progression in Act 1 Chapter 6 (Standard or Arcade).

Putting it Scientifically…0
2 guidesOnline/OfflineSingle PlayerCooperativeMain Storyline
02 Nov 2011
10 2 0
Play the campaign on any difficulty to get this achievement. Complete Act 1 Chapter 6 and it will pop up. Playing with a buddy will help you get the co-op achievement