Guides
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- Overachiever
Fastest way that this can be achieved is by playing 1 GP on normal difficulty (as 1 upgrade wants you to win a GP) and you can knock out the "Non Time Trial" ones there aswell which is Drift 5 seconds and boost 10 times.
Rest is all doable in Time Trial and the map ive that seems to work the best is
Desert → 8 Ball highway