Go to the Coober Pedy Town Bucket List Blueprint Point
(NE of Outback Festival, N of the Redstone Airport) and create a short Route type Bucket List. Make sure to set a slower time the first run you do on it so you can actually beat it to complete this Challenge.
EDIT: Thanks to Bonxy
in the comments for saying you don't even have to beat your Bucket List, just create it!