Here is the full list of all 20 Carto achievements worth 1,000 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox One.
Complete the game 100%.
Visit the airship.
Find something mysterious in the lake.
Finish the three levels of the Tower of Hanoi in the fewest steps.
Behold the legendary flame tornado!
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.
Finish chapter 7.
Finish chapter 6.
Finish chapter 5.
Learn nothing about cactuses.
Finish chapter 4.
Finish chapter 3.
Finish chapter 2.
Finish chapter 1.