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