Here is the full list of all 44 MiniDrivers achievements.
Get all the stars at the American Tour
Win a race by falling three or more times into the water
Under the effects of the Freeze-o-Kimi, freeze the one that hit you
Get all the stars at the European Tour
Use the oil 50 times
Use the turbo 50 times
Destroy three cars in a row with the steamroller
Destroy five cars in a row with the steamroller
Get the 100% of the performance of a car
Use the steamroller 50 times
Use the Freeze-o-Kimi 50 times
Win a race in every track
Get all the starts at the Ivanovich Tournament
Get all the stars at the Asiatic Tour
Finish 100 races
Use the boomerang 50 times
Use the safety car 50 times
Use the tyre 50 times
Win 5 races in a row
Win a race crossing the finish line backwards
Finish a race without going out of the track limits
Hit yourself with the tyre that you threw
Win a race under the rain
Go from 8th to the 1st in on the first lap on a rainy race
Win a race without braking
Win a race without using a power up
Finish third on a race
Get all the stars at the First driver tournament
Get all the stars at the MiniDrivers tournament
Finish the Red Rocket challenge with the #1 driver of the team
Finish the Dark nightmare challenge with the #1 driver of the team
Win the MiniDrivers season in normal level
Win the MiniDrivers season in high level
Win the MiniDrivers season in extreme level
Win a reward at the Weekend Tournament
Unlock 20 cars
Get the 100% of all the power ups of the car
Get the 100% of performance and power ups of a car
Finish the Monaco track without braking
Finish a race making respawn 20 or more times
Win in Italy with Red Rocket
Finish the season with 25 or more points against your rivals
Win in Monaco without crashing
Win with a Minotus crashing all your rivals