Very simple achievement and can be done on many different games.
At a certain point in your game you will see a blue (player 1) silhouette appear on your screen. A few seconds later pies will be thrown at you from either the left, right, or top of the screen. One pie will come at a time. Simply move the right stick left, right, or down to dodge the oncoming pie.
If your playing a two player game a red silhouette will also appear for player 2.
Pies coming from the left of the screen require you to dodge right.
Pies coming from the right require you to dodge left.
Pies coming from the top require you to lean back (hold down on right stick)