This achievement is sure to make you "fly like an eagle." In the game Assassin's Creed II, you're introduced to a bunch of new weapons and skills that you can use to take down your victims. One of the coolest new additions is that of a flying machine or glider. This can be used to travel from once place to another and can even be used to attack nearby archers. Doing that can actually result in the achievement, Fly Swatter. So check out this tutorial on how they did it and how you can do it. Enjoy!