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