The way i done it and its a lot quicker than boosting.
Have 2 Xbox's, 1 with your main account the other with a dummy and 2 copies of the game.
Set up a player match on Aviator Loop, 1 lap, special cars using the Angelus with max nitro.
When the race starts, return to the lobby with your dummy account and finish the race with your main account which takes about 30 seconds.
With loading time it takes about 1 minute per race so 200 mins and your done with this boring achievement