MXGP 2019 - The Official Motocross Videogame

This has to be done in Grand Prix which is found in the Quick Mode menu.

Under race options Ensure event type is set to Full Weekend. Race Length Quick and AI set to very easy.

For Track go to 'Easy Money' by Dreadlife Scarz which is under tracks with most likes. Laps around here take around 19-20secs to complete.

Now all you have to do is win the Qualifying, Qualifying race and the two races. Which shouldn't be too much bother if the AI is set to very easy. Achievement will pop after the final race assuming you have won all sessions.