The easiest way to unlock this is to set up a Custom Event with the following:
• 8 different Events, using 8 different Rallycross Locations.
• Each Event set to Single Race, RX Supercars 2019, 2 Laps.
• AI Difficulty set to 0 (Very Easy).
Whenever you win an Event the Achievement Tracker will increase by 12.5%, unlocking after you complete 8 different Locations.
The car you will need to drive the Audi S1 EKS RX quattro, with either Bakkerud or Doran's livery. These are Liveries 1 and 2 on the list of available options.
Doran's livery is the same but with purple flashes instead of blue.
Please note that there is an Audi S1 EKS RX quattro in the base game. This is the 2018-spec car and is not eligible for this Achievement. The car you're looking for is the DLC version.