Here is the full list of all 20 Star Sky 3 achievements.
They Meet at Last
Path to the Waking World
Dark turned to light
Together forever
Use it well
It is uncovered
A beautiful thing
A trait passed on
She is watching
The guardian
Where they roam
Free at last
Being friendly
Release it
Friendship
Grow more
Fruit from the tree
A magic gift
Water or not
They are precious