There's no medal for this mode is there? If someone else shows up again, and there's an option for a team game, pick it cuz if I get a teamate you can kill him 'n I'll heal him, and if you get a teammate hopefully I can kill the VIP/MVP or whatever.
For medals of course there's Ultra Kill and Reign of Terror, plus BombKart, Assassination, Wrecking Crew, Goal!, Medic, Double Tap, and Assist.
There's also a couple achievements I don't know how to get, considering that I've gotten 100% of the secret items (including blueprints) in campaign. One that still says '? Secret!' and the one for obtaining all the weapons blueprints.