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Team up Captain America with Human Torch (Co-op)
A second controller is needed for this achievement! The earliest you can unlock this is on the mission 'Red Head Detention'; once Captain America joins Human Torch in the fight against Red Skull just plug in the second controller & the achievement should pop. This is also possible to do in Free Roam or Free Play.
Credits to ; Darth Grif55 Xbox360achievemets