Sway Me NowG 15

Sway Me Now G15:
Perform 25 360s

You can do a 360 by double tapping the down arrow key on the keyboard to spin your car around. This will slow you down, but will also reward you with a little nitro. You could just do this over and over again and intentionally lose a race to get this achievement done, but this will probably come naturally working towards some of the other grindy achievements.