Win a 1 vs 4 Multiplayer Custom Game with no Allies against 4 Harder A.I. opponents.
Finish a Qualification Round with an undefeated record.
Win a 1 vs 2 Multiplayer Custom Game with no Allies against 2 Elite A.I. opponents.
Win a Free-For-All Unranked game as each race option.
Complete all the Outmatched achievements.