1. Alien Swarm Achievements
  2. Perfect achievement
Alien Swarm

Alien Swarm

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Alien Swarm
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Perfect achievement in Alien Swarm

Perfect

Complete a mission on Normal difficulty or harder without receiving any damage.

Perfect0
Online Mode - These achievements require a connection to live services for playing an online game mode, for sharing content, accessing leaderboards, or validating data with a server.Cooperative - These achievements can be obtained by two or more players in a cooperative game mode who have met the achievement requirements.Difficulty Specific - These achievements require that the game be played on a certain difficulty level.

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