Here is the full list of all 20 Ruya achievements.
Solved all puzzles in world eight
Solve every puzzle in the game
Look for home
Solved all puzzles in world seven
Look for love
Solved all puzzles in world six
Look for truth
Solved all puzzles in world five
Look patiently
Solved all puzzles in world four
Look up
Solved all puzzles in world three
Look around
Picked a mushroom
Solved all puzzles in world two
Look within
Solved all puzzles in world one
Look carefully
They're musical
She's shy