Tanning Salon Trophy in Dying Light 2 Stay Human
Use the UV Flashlight to kill a Viral.
How to unlock Tanning SalonYou obtain the UV Flashlight during the main story so you'll have to wait until you have it to get this trophy.
This trophy is a bit misleading though, as the UV Flashlight won't kill the zombies, it will simply weaken and repel them. So to get this trophy you need to use your UV Flashlight until a zombie is down on his knees, then kill it with your weapon. This might be a bit finicky so do it on weak zombies until it eventually pop. Using to jump on their face when they're on their knees doesn't unlock this trophy so don't bother with that.