Alien Swarm achievements
1,914
(660)

Alien Swarm

3.4 from 64 votes

There are a maximum of 66 Alien Swarm achievements worth 1,914

2,203 tracked gamers have this game, 49 have completed it (2.22%)

Achievement Details

Hat Trick in Alien Swarm

Hat Trick11

Complete 2 co-op missions online. Earns a Team Fortress 2 parasite hat.

  • Unlocked by 1,775 tracked gamers (81% - TSA Ratio = 1.11) 2,203  
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