|Thank you for being a friend||15|
|Complete Co-Op campaign|
You don't have to actually complete the whole game in co-op for this achievement. As long as you complete Chapter 4 with a friend/multiple friends then it will unlock.
|Rate this achievement||Average Rating|
|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 101 user ratings.