One of the easiest character achievements to get. Choose the Shape Shifter as your character, and have an AI player that starts somewhere within 6 spaces of your starting space, the Tavern. Also make sure it starts with only 2 Craft. (I chose the Woodsman, whom starts in the Forest, four spaces south.)
Now roll to see if you get the number needed to encounter the AI player's character, use a Fate point to reroll if needed. If you still don't get the right number, don't move, but instead exit the game and reenter it. You'll be able to redo the rolls. Do so until you get the right number on the die. (4 for the Woodsman.)
Then choose to Encounter the Character and fight them. Choose Psychic Battle, as you have 2 points more than them in Craft. Fight them(use Fate points and/or exit and reenter the game if needed) and when you beat them, choose to take a Life from them. When you do so you get the option to Shapechange. Do that and the achievement unlocks.
This one took me literally 2 minutes.