Titanfall

This is obtained in the Frontier's Edges DLC on the map Export.

There is a green building near the water that has "Customs and Immigration" written on it. Get to the top of it and there is a room that is called " Water and Power". Go in and shoot the red cable in the center. This will cause a short and spew electricity onto the other side of the map. You know you have received the kill when the kill log states you killed someone via "Electrocution". This is also a fantastic way to Gooser as I have gotten a few already by doing this.

Hi guys

All the solutions here are good. I just found a very easy way to get this achievement.
It can be done in the new mode FRONTIER DEFENSE.
Very easy and quick.

1. Set a custom match in EXPORT and turn open to public off.
2. Clear the first wave normally
3. Run fast to the green building with "Customs and Immigration" written on it. Get to the top room.
4. Keep shooting the red cables until you see the hitmarker.

An Atlas titan will be doomed and you should see "YourGamerTag [Electrocution] Atlas" in the feed. Also you can see the titan suffering in the top right of your screen

Let the enemies destroy the Harvest. You have 2 retries just do the same to make sure everything works fine. The achievement will unlock when you get back to the lobby.

Here is a video where i did it twice.

Hope this will help you guys as you helped me a lot.
This is my first solution .

Both solutions above are correct, however I wanted to add that the enemy DOES NOT need to be in the trap, just killed by the electricity.

For example: I got this by simply shooting the cable while some grunt's were hanging out in the room. It electrocuted two of the three. I did not kill anyone in the actual trap. At the end of the round, the achievement popped.

This is found to the left of the IMC spawn and look hope you enjoy post how I can improve and thanks. Also you need to shoot the red in the middle to start the trap just like the video shows or an action of hitting

For those doing this without boosting I did it when my team lost. The evac point is right next to the fence and I shot the cables whilst the opposing team were heading that way. I zapped 2 of them.

Another solution for anyone still struggling.

I've found the easiest way to get this achievement is to wait until you play the map on Last Titan Standing. As soon as a round starts head for the building, and then keep shooting the cables when you can.

Most people will split off to that side of the map and be fighting out in the area with the electricity. After a couple of times setting the trap off, you may find that titans are becoming doomed and pilots will be getting out. The electricity will finish them off if you are lucky.

I managed 3 kills in one match with this method so it certainly is the best way I've found for completing it.