For this trophy, you’ll need to use the rocket launcher (upgraded with
Heavy Warheads) and, optionally, the Rage skill (preferably upgraded).
Both chapters 14 and 16 have areas that will be best to unlock this achievement. Chapter 14 has a ton of guys in an area with bridges and cover, whilst Chapter 16 has one very long bridge. I suggest Chapter 14, as that’s where I unlocked it. It’s near the start.
You will also unlock the
Slaughterhouse trophy if you don’t have it already.
The Slaughterhouse trophy in Shadow Warrior worth 39 pointsKill 5 enemies with one shot on normal or higher difficulty setting in campaign modeThe most effective way to get 10 kills with one shot is to gather all the guys in the area (as most are frozen until you walk near them), until everyone is chasing you and then fire, making sure they are all close to each other.
I would advise walking into the building on the left last, as it provides good cover and bunches up all the enemies in the doorway. You’ll probably have trouble getting out of here, so Shockwaves and Water Traps may help. That and jumping a lot (Healing too).
You can either shoot inside the room or rush outside and do it there. You’ll want to jump and fire (and/or use laser-guided missives) to get a good shot. Optionally, you could set them on fire with your flamethrower to weaken them. You should try to stay below 30% health here for Rage to be active too, as that damage bonus will come in handy.
You will probably need to attempt this a few times, as it can be a real pain, but it is possible. Hope this helps.