Here is the full list of all 39 The Witch's Cauldron achievements.
It's Lady Witch for you, peasant!
Just reward for a witch most notorious
They won't live in fear no more
Be a good-for-nothing witch
Get too kind for your own good
Not your ordinary support group
Meddle in politics. Pay the price
The king is dead! Long live the king!
Find faith in your heart
Force the bishop to rethink life, God and everything
Break the pact
Show must go on, even if no one's watching
Unlock all magical potions
Time to open a tavern will all these recipes
Break the triangle
Dead men tell no tales
Help to rouse the deep one
Save the golden rooster
Get rid of the mushroom circle
Make the pig fly
Flood the mines
Save the oak grove once and for all
Destroy all scarecrows in the neiborhood
Nothing is certain but them
Help create the masterpiece
He brought it upon himself
Uncover the whole story of the ancient chalice
Don't meddle with powers that be
Help two friends find the rainbow drakkar
Help the guard become a vampire slayer
Kickstart the bard's career
You supplied the knight with your strongest potions
Meet the cow and help her
Turn the demon into a lantern
You brewed your first potion
Unlock your first potion
Make a deal with the pixies
Bring the dead back to life
Spoil the innocent girl