Complete the Chicken Bomb Mini-Game without getting hurt. This unlocks a tile on the Inner Board.
After progressing through the first level, Millfields, choose the right-hand side path to do the Chicken Bomb! mini-game. It is recommended that you do this with 3 AI players, to avoid wasted time and effort, unless you and your friends want to take turns getting this achievement. Your objective is to win without being hit, but don't worry, if you fail, you can choose to play the mini-game again at any time. This achievement isn't too bad, just remember that the more the chickens are flashing, the closer they are to exploding!
My tips are to just use the :bbut: button to roll, in a circle, on the outside of the arena, avoiding any of the chickens until everyone else is eliminated, and you are left standing.