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