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