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