Resident Evil 7: Fly Swatter - Trophy/Achievement Guide
Last update: 03 September 2020
Requirement: Shoot and knock back Marguerite when she's leaping at the main character.
Comment: You will have a chance to unlock this achievement after you get to the greenhouse (it's the second old house on the map) and begin a boss battle with mutated Marguerite (the battle will commence after you use the stairs leading to the upper floor of the house).
Don't try to win the battle (you should repeat it after getting the achievement for a better overall result) and focus solely on completing this achievement. The objective is to knock back Marguerite when she's trying to leap at Ethan. This occurs not long after Marguerite attaches herself to the ceiling (screenshot 1) or to the wall. It's recommended to use a shotgun for the purpose of this achievement (screenshot 2). You have to be extra fast so that Marguerite doesn't hit Ethan before he manages to fire his weapon. Don't worry if you won't get the achievement the first (or the second) time and keep trying. You'll know that you've been successful when Marguerite will crawl back to one of the holes after you've fired the shotgun.