This one isn't too hard if you know what you're doing, it requires you to get 1st place in a 1000 HP race in any game mode (Championship, Quick race, etc.) without your character resetting (turning ghostly after being hit by an opponents item or driving too far off the track). I'd suggest using El Zipo as your driver, as his special ability allows you to speed ahead of the other racers as well as making you invulnerable to attacks. It doesn't matter what car you use either. I'd also recommend saving your shield until a Death Bat is coming your way, just in case you've used your boost already.