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