Alien Swarm achievements
1,776
(660)

Alien Swarm

3.3 from 86 votes

There are a maximum of 66 Alien Swarm achievements worth 1,776

3,067 tracked gamers have this game, 92 have completed it (3.00%)

Achievement Details

Prototype Professional in Alien Swarm

Prototype Professional19

Kill 250 Swarm with a Prototype Rifle.

  • Unlocked by 861 tracked gamers (28% - TSA Ratio = 1.88) 3,076  
Do you have a question about this achievement? Please post it in the Alien Swarm Forum