|Reach 100% in at least two skirmish missions in the coop mode.|
Host a match and just have patience. Or you can join one. From my experiences most people who play this game are only playing for achievements. So you won't have to wait too long for someone to join your game or to find one. It's better to get a team of at least 3 people to go through the missions faster. Make sure to keep track of what missions you've done so you don't accidentally redo them.
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User Score is based on 107 user ratings.