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