Here is the full list of all 12 Pale Moon Crisis achievements.
Have a bar of chocolate.
Use the toxic herb.
Keep HP full at last.
Clear hard mode.
SP becomes 0.
Escape without Bruno.
Kill a Maid with knife.
Kill a Giant with knife.
Kill a Slime with knife.
Kill a Jumper with knife.
Kill a Devil with knife.
Kill a Boss with knife.