Here is the full list of all 38 MiniBikers achievements.
Use the safety car 50 times
Use the chicken 50 times
Use the machine gun 50 times
Use the mace 50 times
Hit yourself with the mace you have thrown
Complete a race reappearing 20 or more times
Complete the race without using any Power Up
Complete a race without leaving the track
Win a race without braking
You have placed third in a sponsored race playing with a sponsorship
Get all the starts at the Ivanovich Tournament
Get all the stars at the Asiatic Tour
Get all the stars at the European Tour
Get all the stars at the American Tour
Get all the stars at the First driver tournament
Get all the MiniBikers Tournament stars
Win the race by crossing the finish line backwards
Win the Weekend Tournament reward
Complete 100 races
Win the MiniBiker season in the Normal difficulty level
Win the MiniBiker season in the High difficulty level
Win the MiniBiker season in the Extreme difficulty level
Unblock 27 bikes
Gain 80% of a bike’s performance
Gain 80% of all a bike’s PowerUps
Gain 80% of a bike’s performance and PowerUps
Win once on every track
Use turbo 50 times
Use the thunder 50 times
Use the butter 50 times
Win a race falling three or more times into the water
Win in Italy with a Red Rocket
Sear three bikes in a row with the thunder
Sear five bikes in a row with the thunder
Win the season by scoring 25 or more points over your rivals
Win 5 races in a row
Go from 8th to 1st on the first turn in the rain
Shoot at the one who shot you while stunned