Snicker-snack! Trophy in Alice: Madness Returns
Acquire the Vorpal Blade
How to unlock Snicker-snack!
Story related, cannot be missed. In the Vale of Tales chapter, you will jump on a blue mushroom, that will shoot you straight into the air. You will come across a set of dinosaur bones and the cat will appear, the Blade will hover over to you. Once the cat stops talking and you press to close the letter and learn how the blade works, the trophy should soon follow.