07 Sep 2020 07 Sep 2020
This achievement can be a bit buggy.
I completed 3 seasons in career and it didn't pop.
Thanks to Blue n Gold Eel for reaching out and saying sometimes you have to do an 8 race championship for it to unlock.
Bingo bango sure enough after the final race it popped.
If you do have to go through the championship mode to unlock it you can set the race length to 5%