Party at Sky Vault Trophy
Party at Sky Vault
Win a game session with 2 friends splitscreen.
This one requires 3 controllers (DualShock, PC Logitech Pad, and the official Sony remote control for a Blu-Ray player all work, but not a Move controller). And if you happen to have a PS2 controller with a convert wire, it'll only take 2 controllers.
It can be done in "Battle", "Private Match" and "Practice". This can be quite tricky to do solo as the bots can actually be pretty difficult sometimes, so it's suggested you either actually play with 2 friends, or you get 1 or more friends on the opposing team to make it easier for you, e.g. letting you kill them for Solar, not helping their teammates, etc.