Achievement: Blind Ambition
Destroy 5 drones in Casual/Ranked Multiplayer. (Secret)
Unlocked this one pretty easily on my second night of playing. When you're on the defense side, just destroy the tiny drones the attackers are using to investigate your stronghold. Many of them just get abandoned once the round starts so you'll see them just lying around the place. Also counts when you destroy them mid-match if the attackers decide to utilize them again.