Here is the full list of all 20 Carto achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Read all stories in the Story Chalet.
Complete the game 100%.
Finish the three levels of the Tower of Hanoi in the fewest steps.
Visit the airship.
Find something mysterious in the lake.
Behold the legendary flame tornado!
Give a plant your full support.
Finish chapter 10.
Finish chapter 9.
Finish snowman buddy.
Finish chapter 8.
Finish chapter 7.
Finish chapter 6.
Listen to the quartet of birds.
Finish chapter 5.
Learn nothing about cactuses.
Finish chapter 4.
Finish chapter 3.
Finish chapter 2.
Finish chapter 1.