The torch mod does work, but actually, if you don't wanna have to go out of your way for a sidequest you don't have to do, then just go with the main story, and at some point in Act 1. (I think it's close to after getting to the lifeguard tower), you'll get a shock mod. All you need is some wire, batteries, and duct tape I believe and just make that and you'll get the achievement.
This is one you'll probably get early on in the game!
z 4assed monkey said: "Indeed, the shock mod is rewarded upon completing "Black Hawk Down" for Sinamoi in Chapter 3. That's how I got this achievement."
So very early in the game. Doesn't require a random sidequest.