Here is the full list of all 50 MXGP 2021 - there are The Official Motocross Videogame achievements.
Reach Prestige level 100.
Complete all Career Challenges.
Create and share a Waypoint track.
Complete a race with Race Length set to Realistic.
Reach the first position in all sessions in a race set to a Full weekend.
Create and share a track with the Track Editor.
Reach Prestige level 75.
Complete a Waypoint race.
Win a Grand Prix at Legacy - Agueda in any game mode.
Win a race with AI Difficulty level set to Realistic.
Complete a Career Challenge.
Save your bike's Setup for the first time.
Win a race with physics level set to Advanced.
Cover 30 km - 18.64 mi in Free Roaming in the Playground.
Cover 15 Km - 6.21 mi in Free Roaming in the Playground.
Get a total of 300,000 MX Credits.
Access Photo Mode for the first time in any game mode.
Reach Prestige level 50.
Purchase any bike for the first time.
Start replay at the end of a race in any game mode.
Complete a valid lap in Time Attack.
Make a purchase on the Rider Customisation page for the first time.
Get a total of 200,000 MX Credits.
Win an MXGP Championship in Career mode.
Get a total of 100,000 MX Credits.
Win a Grand Prix at Legacy - León in any game mode.
Reach Prestige level 25.
Get 10 Holeshots in any game mode.
Win a Grand Prix at Orlyonok in any game mode.
Perform a Scrub in any game mode.
Win a Grand Prix at Pietramurata in any game mode.
Win a Grand Prix at Intu Xanadù - Arroyomolinos in any game mode.
Win a Grand Prix at Teutschenthal in any game mode.
Win a Grand Prix at Afyonkarahisar in any game mode.
Win a Grand Prix at Kegums in any game mode.
Complete a race without using Rewind.
Win a race without falling and without using Rewind.
Win a Grand Prix at Lommel in any game mode.
Win a Grand Prix at Loket in any game mode.
Win 3 Duels.
Win a Grand Prix at Legacy - Ottobiano in any game mode.
Win a Grand Prix at Oss in any game mode.
Get a Holeshot and finish first in the same race.
Win a Grand Prix at Maggiora in any game mode.
Finish first in a race with the weather set to Rain in any game mode.
Win a Grand Prix at Matterley Basin in any game mode.
Win a Grand Prix at Legacy - Ernée in any game mode.
Accept the invitation to a Duel.
Complete a lap without falling on any track and in any game mode.
Use Rewind for the first time in any game mode.