Here is the full list of all 17 Obulis achievements. It takes around 10-12 hours to unlock all of the achievements on Windows.
Complete the level "Gnarly Vines V Ultra"
Complete the level "Windmill I Ultra"
Find all 3 tiles to complete the Sun Stone.
Complete the level "Dark Forest III Ultra"
Complete the level "Pond X Ultra"
Complete the level "Pharaoh's Tomb I Ultra"
Complete the level "Waterfall XI Ultra"
Complete the level "Dungeon V Ultra"
Complete the level "Garden V Ultra"
Complete the level "Pond III Ultra"
Complete the level "Antiquity XI Ultra"
Complete the level "Clock Tower VIII Ultra"
Complete the level "Pharaoh's Tomb VII Ultra"
Complete the level "Desert VIII Ultra"
Find all 3 tiles to complete the Earth Stone.
Find all 3 tiles to complete the Blood Stone.
Collect all 347 1/2 stars in the game.