A couple of pre-requisites for this.
You need to unlock the 'Born Fast' story of Horizon Adventure by gathering accolades. It's the second of the Street Scene unlocks.
You also need to reach the Hall Of Fame to unlock the last chapter of the story, which is the Tristan chapter. To reach the Hall Of Fame you need to unlock all 21 of the Horizon Adventure festival stories, plus one more 'accolade level'. You get accolades for pretty much anything in game.
PR stunts are a quick way to earn 850 accolade points a time if you 3 star the speed zones and danger zones.
After you've reached the Hall of Fame the Tristan chapter will be unlocked. You need to 3 star it with a time of 2.25 to get the achievement. It's pretty tight but not too difficult.
If you've 3 starred the rest of the chapter you will also unlock