Play and finish a ranked online game with 3 controllers. Guitar Hero and Rock Band instruments work if you do not have 3 regular controllers. If you still do not have 3 controllers, you can try playing with your friends online.
If you're attempting to get this trophy the legitimate way with three other people on your side, remember that you must actually finish the game. With three human-controlled teammates you can easily beat your opponent into submission. Of course if you do this you increase the likelihood of them leaving the match early in which case you will not be awarded the trophy.