Here is the full list of all 28 Super Woden GP 2 achievements.
You have 10 cars
You have washed your car.
You've earned 25 Stars.
You have visited the music room.
You have 5 cars
Win your first Rally
You've earned 10 Stars.
You have driven more than 100 kilometers.
You've changed the oil.
Install an upgrade for the first time.
You reached 200 Km/h
You've won your first race.
You bought your first car.
Welcome to Super Woden GP 2.
You have 25 cars!
You have 50 cars!
You have... 100 cars.
You've earned 50 Stars.
You reached 300 Km/h
You don't like to wash the car.
You have driven more than 500 kilometers.
You have driven more than 3.000 kilometers.
You have driven more than 5.000 kilometers.
You've won the World Championship.
You have completed the normal route with one credit.
You have completed the hard route with one credit.
You have won the 400s World Rally Championship.