Forza Motorsport 6: Apex

From the main menu:

Free Play
Select Track > Top Gear > East Circuit (Day)
Select Car > Ariel Atom
Game Options > Max Drivatars - 15, Drivatar Difficulty - New Racer, Limit Drivatar Aggression - On, Laps - 2, Collision Mode - Always Off
Assists - Do whatever you're comfortable with, but change braking to at least 'ABS on' so it doesn't slow you down when coming to a corner

Start the race and go full throttle until you see the red braking line. You can go ham into the turns and break a bit past where it turns red but keep the wheel straight. Cut the corners tight and slam the throttle again. May take some trial and error but you will get the hang of it. Two laps because I was not able to catch up to the first car fast enough on the first lap.

Go onto free play and select the Ariel Atom as your car. Make sure max drivatars is set and you can choose any difficulty and assists. I would suggest doing this on the third top gear track as well as it is the shortest.

Simply win the race and the achievement is yours :)

Not popping for me... did 2 races in different locations and no achievement. I hope its just temporary glitch.