You acquire the Witches Talisman in Cemetery Hill.
Proceed up the first ramp (with the boulders) then head all the way left, drop down, open the chest, this will give you a Club, use this to smash the boulders in your way, head all the way right on the lower level, smash the boulder blocking your path, head through to the staircase, smash the bookcase opposite (top right) in this room, proceed through. With your Club equipped, hold CIRCLE over the flame then head up the staircase you previously passed.
Hit the Altar in the middle of the room with the prison cells. Kill all of the Frankenstein’s that are released and the collect your Witch’s Talisman (circular Pentagram) from one of the cells
Now that you’ve acquired your Witch Talisman, head off to The Enchanted Earth level, take your first left to find the Witch’s Cauldron, use the Witch’s Talisman on the cauldron, you need to Accept The Quest
This will see you go through a series of Ant Caves collecting amber and freeing Fairies, the amber is collected easily enough, proceed through the Ant Caves smashing and killing everything as you go.
The Fairies are behind coloured glass sections at the edges of the caves, you’ll find them easily enough. At the end of the caves you’ll face the Ant Queen, use ranged weapons to have a much easier time taking her down. When you’re topside again you’ll have the first quest completed
Your second quest will be in the Pumpkin Serpent level, make your way through the level until you get to the boss section, just before this and just up from the well (where the level chalice is) will be another Witch’s Cauldron, use your Witch’s Talisman here to start a quest for a Pumpkin Pig. He’ll task you with taking out the boss
Go off and destroy all of the green & yellow pods to initiate the fight, it’s easy enough, hit all of the stalks until the boss becomes vulnerable, rinse and repeat, pods, stalks, boss until the Pumpkin is defeated.
Upon doing so, return back to the cauldron where you’ll complete your Quest and unlock your Trophy