MXGP 2021 - The Official Motocross Videogame (EP)
51 Achievements
72-88h
PS4
A MX rider at Snowdonia
Cover 15 Km - 6.21 mi in Free Roaming in the Playground.
20.5%
How to unlock the A MX rider at Snowdonia achievement in MXGP 2021 - The Official Motocross Videogame - Definitive Guide
This includes races in the open world. I've also found that you can get a decent amount of mileage out of just holding the right trigger down as you often end up turning around naturally when crashing out