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