Here is the full list of all 17 The Gardens Between achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Release the hidden Garden Friend.
Arina throws popcorn at Frendt five times.
Super Silly Crow is defeated.
A Cosmic Garden Friend phones home.
A Garden Friend gums up the pipes.
A Garden Friend follows on a school trip.
A Garden Friend sneaks a look.
Super Silly Crow escapes the TV.
A Garden Friend is hiding in the Esky.
A sneaky stowaway Garden Friend.
Friends apart, memories remain.
Arina really shouldn't be pressing buttons.
Pluck the moon right out of the sky.
Arina’s at the end of her rope.
Saw the plank. Next, get a hammer.
What's under the table cloth?
Restore the board to a clean state.