Here is the full list of all 50 Moto Racer 4 achievements.
Unlock 165 stars
Succeed 55 challenges
Win a ten-player online championship
Win a ten-player online game
Play a ten-player game
Finish a race 10s ahead of your nearest rival (single race - 'God' difficulty)
Do 200 swerves
Unlock the eleventh chapter
Succeed all the slalom challenges with 3 stars
Win the 9-3 challenge with a Gold performance
Find all the shortcuts in the game
You knocked down 100 riders with swerves
Upgrade the T.U.R.B.O on Jody and Saul's bikes to the max
Win all races in the 6-5 Championship with Amund
Win the 6-2 challenge with a Gold performance
Reach a total of 500,000 style points in one race
Do a 250-meter drift
Move from one bridge to another over Spider Gorges
Ride on a truck's trailer
Score more than 800 points with a single trick
Do a double flip
Succeed chapter 5
Do a wheelie on the Great Wall of China
Reach a total of 180 seconds of slipstreaming during a race
Successfully perform 200 T.U.R.B.O landings
Successfully attempt 50 perfect landings in one race
Do 3500 wheelies
Reach a total of one hour in mid-air
Score more than 5 000 000 style points
Brush against vehicles in traffic 300 times
Upgrade Wrench and Bolt's bikes to the max
Successfully attempt 200 orange T.U.R.B.O boosts
Score 3000 high-speed points in one go
Customize Stella to the max
Win the 3-3 challenge without using the turbo
Reach a total of 150,000 style points in one race
Perform a whip on a dirt bike
Keep your light trail for 120 seconds
Reach a total of 50,000 style points in one race
Do a Flip + Trick combo
Reach a x10 style combo
Do 250 wheelies
Do a trick
Succeed a challenge
Do a 10-turn donut
Do a 5-second burn out… and win!
Land on an opponent and make him or her fall down
Make 100 online opponents fall down
Win 100 races online
Finish a private online game