Here is the full list of all 18 Super Woden GP achievements.
You have 5 cars
You reached 200 Km/h
You've earned 20 Stars.
You don't like to wash the car.
You've earned 10 Stars.
You have won your first race.
You bought your first car.
Welcome to Super Woden GP
You have 25 Cars
You have 50 cars
You've earned 50 Stars.
You've earned 100 Stars.
You reached 300 Km/h
You have driven more than 3,000 kilometers.
You have driven more than 500 kilometers.
You have won the World Championship playing on Hard level.
You have won the world championship with a reputation higher than 8'5.
You have driven more than 5,000 kilometers.