Air Kill - Kill an opponent in the air.
Destruction King - Win ten online destruction games.
Don't touch me! - Win a race without getting killed.
Firebooster - Kill ten opponents with every Fireboost type.
First Steps - Complete all challenges for one character.
Massacre - Kill ten opponents in one race.
Online Endurance - Finish fifty online games.
Online Racer - Win five online races.
Serial Killer - Get 100 Kills.
Threepeat! - Complete all challenges for three characters.
Triple Kill - Kill three opponents in 5 seconds.
Winner - Complete all challenges for all characters.