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