Alien Swarm achievements
1,858
(660)

Alien Swarm

3.3 from 72 votes

There are a maximum of 66 Alien Swarm achievements worth 1,858

2,405 tracked gamers have this game, 61 have completed it (2.54%)

Achievement Details

Prototype Professional in Alien Swarm

Prototype Professional20

Kill 250 Swarm with a Prototype Rifle.

  • Unlocked by 581 tracked gamers (24% - TSA Ratio = 2.02) 2,405  
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