Ok i have tried and tested and this 100% works.
Jam session, rallycross, LA coliseum, vermont avenue 1 lap.
Now go in the advance settings turn impact rating on and also turn driving assists off.
Also have collisions ON
Now race the track and do not hit anything!
Me and a mate did 5 in a row and got the achievement. You will know if you're going to get the achievement as the logo next to your tag (green, yellow, red etc) will turn into a white hexagon shape.