Tom Clancy's H.A.W.X. 2

Do as the description says, play 100 Team Battle games. Both ranked matches and player matches count. I never tried just joining and quitting over and over but I seriously doubt this would work anyway. This will come in time if you boost lots of other trophies, or if you simply like playing online. If you do have leftover games to play, host your own 5 minute matches to make them as short as possible.

I found that it helps to have player XP on realistic because people who join get bored easily on these really short matches, having to work really hard to kill other players, therefore they usually quit. I found that Open Range was a popular map too.