Here is the full list of all 28 STAY trophies - there are 8 bronze, 13 silver, 6 gold and 1 platinum.
Collect all the other trophies
Back to square one
Become the perfect soulmate and never leave Quinn
End Quinn's journey with a feeling of Denial and Isolation
To be continued...
Reach the final chapter with the highest level of trust
End Quinn's journey with a feeling of Anger
Unveil all secret rooms
End Quinn's journey with a feeling of Bargaining
Reach the final chapter with the highest emotional bonding
End Quinn's journey with a feeling of Acceptance
End Quinn's journey with a feeling of Depression
Cracking the final code
Dance with the ugliest partner
Memories shaped into bits and pieces
Play it cool
Bad hair day not allowed
Don't lose sight of the north
Never leave the magic circle
Hail to the Chief
Board game solitaire
Guardians, feathers and the unknown
A life within a life within a life within...
A neverending book which is not for Bastian
Don't leave during a time interval
Never kill the cat
Who are you, stranger?
And then there was light...