Pro - 50 Win 50 single races

[OldBlindDeadJim]

Using the 'Among Freaks' race with the go-kart, you can just drive up and down the straights to make a '0' shaped track, ignoring the extra corners.
Providing you boost all the way down the straights you won't get timed out for going off track.
Should be able to lap sub 20 second laps. Saves about five seconds a lap haha, but that's over four minutes for 50 races! Time that you could spend trying to get 1 billion worth of property damage

[EliteShadowMan]

thought i saw this in the achievement guide...but nice try.