Clear Firing achievement in Alien Swarm

Clear Firing

Kill 25 drones without friendly fire. Four marines must be present in the mission.

Clear Firing0
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.4 Players Required - These achievements require a minimum number of participating players to attempt.
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