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.
Complete a secret area.
Really beat the game.
Complete the garden.
Complete the world map.
Complete the forest.
Complete the abstract area.
Complete the cavern.
Complete the mountain.
Complete the space area.
Find an orb.
Beat the game.
Complete the forest of fall.
Complete the solitary isle.
Complete the ruins.
Complete the lake.