Nickelodeon Kart Racers 3: Slime Speedway

While there's a chance this can unlock sometime while playing the mandatory 40 cups, there's an incredibly easy way to win this pretty much guaranteed.

Go to Single Player > Challenges > "Don't Think, Just Go" (First mission in the first set)

Complete the mission without getting hit, which unlocks the achievement for free since there aren't any other racers on the track. Easy 30G