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