Here is the full list of all 97 Slay the Princess achievements.
Bring the Adversary to Her
Bring the Beast to Her
Fall for the rest of your life
Unleash the power of pacifism on your foe
Cannot die cannot die cannot die
Take the bait from your foe
Freeze in front of a creature on your first meeting
Successfully take the fight to a creature in its den
It was in your nature
Directly attack a suspicious character
Free a creature while under extreme duress
Fool a predator by faking your own death
Fight your foe unarmed and go the distance
Have a voice ruin your happy ending
Free someone who doesn't want to be freed
Bring the Apotheosis to Her
Witness your better's ascension
Dispatch a prisoner
Strike the heart from the belly of the beast
When taken against your will, witness your enemy's freedom
Stuck in a dream without a stair to be seen
Bring the Witch to Her
It was in her nature
Bring the Deconstructed Damsel to Her
It's all she wanted
Slay the Princess, and make some enemies along the way
Take on a spirit and destroy it the only way you can.
Bring the Drowned Grey to Her
Drown at the hands of a faded spirit.
Kiss her
So have you become nothing once again
This is it
You don't know what you're doing
What can I do to make you stop?
Bring the Wounded Wild to Her
Some tears can never be mended
Work through some issues and learn to trust again.
Bring the Razor's heart to Her
Allow a sharp foe to vanquish herself
There's no going back now
Why have you come back?!
And at the end of that path is a cabin
Beget Strange Endings
Break the mirror without asking any questions.
Bring the Thorn to Her
Share a thorny prison
Abandon her in a thorny prison
Hand your power to a suspicious character.
Bring the Nightmare to Her
Let your terrors loose upon the world
Only new beginnings
We Carve Meaning
Bring the Tower to Her
Pledge your loyalty to your better.
Bring the Prisoner's head to Her
Free a prisoner
Bring the Den to Her
Successfully flee from a creature in its den
Dodge a creature until you can dodge no longer
Bring the Networked Wild to Her
Embrace your transformation
Leave a suspicious character in the basement
Bring the Burned Grey to Her
Burn at the hands of a faded spirit
Slay an innocent
Slay the Princess
Bring the Eye of the Needle to Her
Lure an enemy to advantageous terrain and win
Bring the Moment of Clarity to Her
See what hides behind her mask
Bring the Fury to Her
Slay your better
Bring the Wraith to Her
When taken against your will, deal with your enemy the only way you can.
There are worse fates to suffer than a broken heart
Attempt to Out-Wait Your Destiny.
Finish the Game. (The Good Ending doesn't count)
Whatever it is, you'll face it together.
Bring the Stranger to Her
All of this is you
Run out of questions
When everything is possible, nothing is.
Bring the Razor (Full) to Her
You've unraveled
Master yourself and vanquish a sharp foe.
Bring the Damsel to Her
You've withered
Your love will set you free
Bring the Prisoner to Her
You've grown
Become your own jailer
Bring the Spectre to Her
It's you
Pick up a passenger and take her to her destination
You did it! You saved everyone!
You'll know it when you see it.
Return to your destined path, or face the consequences