Here is the full list of all 18 Baba Is You achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Really beat the game.
Complete a secret area.
Beat the game.
Complete the world map.
Find an orb.
Complete the space area.
Complete the garden.
Complete the abstract area.
Complete the forest.
Complete the mountain.
Complete the forest of fall.
Complete the ruins.
Complete the solitary isle.
Complete the cavern.
Complete the lake.