Dishonored Definitive Edition

An easy way to get this can be by purchasing the Agility power with runes, double jumping above enemies, and using a Drop Assassination on them. As long as the prompt appears to perform one, this should count. Drop Assassinations have different animations than stealth or combat kills.

You will have plenty of opportunities throughout the game. Just make sure to get this done before the end of the game or you will have to get all five kills in a single instance of mission select. Once you are above an enemy (preferably guards). Drop kills are a little different than in AC. In Dishonored, you need actually fall towards the enemy. Mid air, you will be prompted to click the attack button. Do it in time and you will see an animation where you plunge your knife in a downward angle. As long as you see the downward stab of the knife, that should count as an aerial assassination.,