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Alien Swarm is a top-down shoot-em'-up game, developed by Valve. It is available for free on Steam. Earning the "Hat Trick" achievement will unlock the Alien Swarm Parasite hat for use in Team Fortress 2.
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Hat Trick
Complete 2 co-op missions online. Earns a Team Fortress 2 parasite hat.
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See also
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Rock Paper Shotgun | | | San Diego Comic-Con 2011 | | | San Diego Comic-Con 2012 | | | Steam Holiday Sale 2013 | | | Steam Translation Server | | | Summer Adventure 2014 | | | | | | ThreeA Toys | | | | | | | |
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