for the main menu,
over to 'Horizon Super7',
to 'Challenge Browser', search challenges.
for search, type 'Alladaskill17' into the 'Creator' box. Use the one listed as "Hoonigan"
This is a sprint as close as the game would allow. Should be straight forward. I forgot to add extra time to complete, but all you have to do is hold down the gas to win.