Alien Swarm achievements
1,953
(660)

Alien Swarm

3.4 from 60 votes

There are a maximum of 66 Alien Swarm achievements worth 1,953

1,956 tracked gamers have this game, 40 have completed it (2.04%)

Achievement Details

Prototype Professional in Alien Swarm

Prototype Professional21

Kill 250 Swarm with a Prototype Rifle.

  • Unlocked by 453 tracked gamers (23% - TSA Ratio = 2.07) 1,956  
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