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