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