BioShock: Infinite may have just come out today, but that doesn't mean there aren't some good walkthroughs for it already. If you're the kind of gamer that digs unlocking all of the achievements (aka trophies), then here's one for you—the Aerial Assassin.
In order to complete this task, you will need to kill 20 enemies with the Skyline Strike. You will be able to pick up the Skyhook weapon (needed for the Skyline Strike) in the natural progression of the game; no need to go searching for it. Once you have the Skyhook, you can start killing your enemies from either a skyline or one of the many hooks spread about Columbia.
It is fairly simple. When you are on a hook or skyline and you have the Skyhook equipped, you can lock onto an enemy and and fly right at them. BioShock is full of awesome weapons and power-ups, but if you want to unlock these achievements/trophies, you have to stick with the hook no matter how easy it would be to use a vigor or other weapon.
Check out this short video walkthrough on how to unlock the "Aerial Assassin" achievement from Square One Games.
Click here for more achievements/trophies for BioShock: Infinite.