So to get this achievement you will firstly need to have purchased both Ryo and Jacky&Akira so that they are both in the race (18500 each, 37000 total), then stay back in the race until you earn Ryo's all-star move (indicated by a key symbol) then use in, Ryo will now control a fork-lift which you flip opponents with, find Jacky&Akira (red sports car) and flip them, voila.