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