Warhammer 40,000: Kill Team
12 Achievements
6-8h
Chapter Brother
Complete a mission in co-op mode
54.9%
How to unlock the Chapter Brother achievement in Warhammer 40,000: Kill Team - Definitive Guide
Played through until I had killed the wierdboy boss at the end of the level, pressed Start on my second controller and then walked onto the lift.
Ding!
You will need 2 controllers for this trophy as there is no Online Co-op mode. Start up any Campaign level, play the game on Single Player until your are near the end, press on your 2nd controller and finish the level to unlock the trophy.
Space Marines don't fight alone, and for this achievement a friend is all you need. Just have a second player hop into your game (local only) and complete an entire mission with them. If you don't have any minions at your disposal, you can always just play with yourself and let player 2 die all the time. Mission 1 is probably the best for that tactic as it is fairly short and doesn't involve running from explosions, giant Tyranid's, or a giant walking robot.
Shiftie Credits: mercianix for this shortcut: Play through the level and just before you finish it, join in with a second controller (for Mission 1, do this just before you leave the reactor room through the large door in the back)