Here is the full list of all 30 Flåklypa Grand Prix achievements.
Completed the story
Got some exercise
Won your first Backwoods Rally race
Completed any type of race
Started building the Il Tempo Gigante
Progressed to see the inside of the Sheik's tent
Completed at least 10 bikes in a single game
Got the moose to take a look
Collected at least 50 balloons in a single game
Enter the house
Played hopscotch
Played your first minigame
Made at least 10 pies in a single game
Collected 3 similar bike parts
Got at least 10 100% bets correct in a row
Filled at least 50 bags in a single game
Cleared all boards
Completed all jigsaws
Completed any medium or hard level without being hit by bees
Watered the flowers
Lambert tried to kick the suspension spring
Made the bonnet lid slam on Emanuel's fingers
Completed all of the Lambert's driving practice courses
Have won Backwoods Rally races in all 4 cars
Won your first race in Racing Mode
Have won races with all racing cars in Racing Mode
Won a race with the Boomerang
Won a race from 8th place in Racing Mode
Won a race on all 11 tracks in Racing Mode
Completed building the Il Tempo Gigante