Alien Swarm achievements
1,909
(660)

Alien Swarm

3.4 from 67 votes

There are a maximum of 66 Alien Swarm achievements worth 1,909

2,220 tracked gamers have this game, 51 have completed it (2.30%)

Achievement Details

Professional Marksman in Alien Swarm

Professional Marksman37

Kill 250 Swarm with a Marksman Rifle.

  • Unlocked by 166 tracked gamers (7% - TSA Ratio = 3.66) 2,220  
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