BioShock Infinite

Hazard Pay

This is on chapter 10 (Finkton Docks), if you haven't gotten it yet, just load up chapter 10 and follow this solution.

Not to give any spoilers, once you get to Finkton Docks (Factory with Fink-MFG. as a giant sign) walk forward and take a right to where 4 guys are cleaning the ground. There is 2 puddles on the ground. Just kill a person cleaning the ground to attract 4 guards. Shock the puddles and stand behind them to have the guards run into the puddles. Once you got all 4 to run and die in the puddles just reload the checkpoint. Rinse and repeat until the achievement pops.

A great place to farm this is in the Atrium Chapter when you are looking for the Warden's Office.

After you ride the elevator up and past the two gun turrets up the stairs, you will enter a room full of inoperable presidential heads, continue down the path up ahead and you will see a Boy of Silence and a group of people who will become melee enemies in the next room. Have the Boy of Silence spot you (eyes turns white, to yellow to red) and lead the enemies in the middle of the room where there is a giant puddle. Use your shock jockey at it and run past it (they are melee enemies so they will run to follow you). You can get 6 or more kills easy and then reload the checkpoint which will bring you a few steps outside this area to rinse and repeat.

The other solutions are great but I still wanted to tell the way I did it, which I found easier than the other solutions.

Immediatly after you get Shock Jockey, you walk into a chamber and 2 guys will charge in on you from a distance, they don't have weapons they just charge in for the melee but they run trough the water, simply cast Shock Jockey on the water and you will fry their brains out :) Couldn't be easier. Simply reload the last checkpoint and you'll re-spawn at the point when you recieved Shock Jockey again. Run in the next room again and rinse and repeat 4 more times until you have the 10 kills, Hope it helps!

Not too long after you find undertow, you'll start seeing tesla coils that Elizabeth can bring in. Just open that tear and pull enemies toward you within range of the coil. Light enemies will be 1 hit by the tesla coil. I got it at the first coil, where there's an airship or 2 of enemies to pull in plus ground enemies. There are more coils a bit later in the game if you don't get it there.

EASY way to get ALL 10 in one battle without reloading.

Best place to do this is Port Prosperity once you get into Grand Central Station and there a big battle. This is the part right after riding the railcar up with the creepy brother and sister appearing doing various things like baseball and dancing.

Once you get into the main room of Grand Central Station you can get 10 kills just in that battle without reloading. Just tear in one of the tesla coils on either side and get the enemies to follow you next to them. There are tons of melee ones who charge you too which is even easier. Just keep sprinting around getting enemies to follow you into them and wait for them to die. Rinse and repeat. Having the gear that makes you sprint faster when shields are down is very helpful as is full shields upgrade. I used a carbine to hurt them with a shot and then bucking bronco to hold them in the air near the coils to make it easier.

I had zero before this part and got 10+ just in this battle without dying or reloading. Should be pretty easy.