|Complete a public Co-op game in the Chaos Invasion mission.|
You have to complete the Chaos Invasion mission (plus the Bonus wave) in a public match to obtain this achievement.
|Rate this achievement||Average Rating (Based on 1 votes)|
|You need to register before being able to post comments.|
|You need to log in or register to use My360Achievements.|
|You need to log in or register to rate games.|
User Score is based on 236 user ratings.