Wolfenstein Youngblood has many different Trophies / Achievements including Swatter. This one requires you to kill 20 Drones. It also nets you a Bronze Trophy.
It is probably one of the easiest Trophies / Achievements to get. It first appears during Chapter 2, Riverside. It cannot be missed. It is also possible during your first playthrough. Just kill 20 of them using any weapon to get this one!
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