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