Tom Clancy's H.A.W.X.
51 Achievements
PS3
Team player
Complete a mission on coop mode.
19.3%
How to unlock the Team player achievement in Tom Clancy's H.A.W.X. - Definitive Guide
Basically, co-op mode is when you go through a level/mission with other players online. There can be a maximum of 4 people in one lobby. Choose any mission of your choice, complete it with a minimum of one other player and this trophy is yours.