Forza Horizon 2 Presents Fast Furious

After acquiring the MP1 and the Charger you will unlock two more events, head to the north most speed event and beat the target speed of 170mph in the P1. You will then have an area on your map to search for the Veyron, once you find it you'll be place into a head to head race , win it to unlock a circuit race.
For those players that are colour blind and are struggling to find the area knifehim says 'Just below saint-martin text, the lancer evo.8 MR bucket list is inside the area'

Beat the Veyron in the race and the car is yours. Fast travel back to the garage using / on the map and the achievement is yours once you enter.

Three races this time.

First and last are straight races, no problems there. 2nd is a speed run you have to hit a speed camera at 205MPH or greater. You can't take your time as there a minute to do it and a few corners to add a little complexity.

May help to turn off assisted breaking for this if you have it on, I was getting 200 to 204mph with the breaking as the system applies it in a prior corner and slows you down too much to get back to 205 for the camera.

Turn it on and popped first run afterwards when I went through at 210mph

As usual cheevo pops when you get the car to the garage.

While I don't think you can do it here as its almost the last car, based on comments only win one car at a time and then return it to the garage for its achievement to pop, for some cars its possible to "win" two without returning to the garage, doing so can mean neither achievements pops and you need to do them again.
Whist annoying reports are that if you exit the game and return it resets so you can still get the achievements but will have to win them again.