Win more than 20 events on your Favorite Location
Go to "Quick Race Weekend" then to "Glencairn West" (it's 0,45 km // 0,28 Miles long) and take the "125cc Shifter Kart". So this Kart helped me with the "Petrolicious Love" Achievement, too. After one round go back to the menu and repeat this (for one round I needed about 28 seconds). After 21 times you get this Achievement.