DiRT Rally 2.0

As always, you can do this in a Custom Championship. Just select Latvia in the Location Select menu and set Format to Single Race, the achievement unlocks this way too. Set the Vehicle Class to RX Supercars.

In the Vehicle Select menu, scroll all the way to the Fiesta Rallycross (Mk7) and press to change the livery. Nitiss' livery is the 5th one and has an RMC logo on the hood.

Win the race and the achievement will unlock right after.

Edit: Downvoted, so editing to give Anima Pura credit for the solution. Simply specifying DLC and Location because I had mild trouble with previous solutions clarity

This can take you as little as 5 mins including setup and racing. Keep in mind this is DLC and is included Season Two.

Freeplay>Custom>Create Championship>Add Event>Bikernieki (Latvia)

Format: Single Race
Vehicle Class: RX Supercars
Weather: N/A
Laps: 2

In the Vehicle Select menu, you're looking for "Ford Fiesta Rallycross MK7". While hovering over the car, a paint bucket should appear in the bottom left of the cars picture.

You need the 5th decal in the list. It says RMC on the hood.


Simply race your 2 laps and win.