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