No collisions occurred during a 4 player match
This requires you not to crash into any other players. Super easy with 4 controllers, considerably harder without. If you are stuck with no extra controllers, setup a 4 player game with 3 AI. Use a map with plenty of cover and give the AI a bubble handicap. Try to spend most of the match hiding away from opponents and let them try to kill each other. Slip out of cover now and then for a cheeky kill if you can.