Victor Vran
90 Achievements
GOG
Gunslinger
Make 10 Aimed Shots in 3 seconds
28.1%
How to unlock the Gunslinger achievement in Victor Vran - Definitive Guide
This is pretty easy. Just get a large group of weaker enemies like skeletons or spiders and mash y with the shotgun. If you get a kill it resets y cooldown.
This needs to be done with a Shotgun and . If you get a kill the meter will refill. Find a group of weak enemies (spiders or skeletons) and just spam . I did it on the "Den of The Broodmother" map quite easily.