This can be grinded easily in memory sequence 8. As you make your way out of the brotherhood building, you will go outside when moving from the second to the first floor. There will be three enemies that you can shock by using your winch on the puddle. Then just restart the checkpoint and do it over and over.
Here is a video guide with English commentary for this achievement!
Here is a playlist of guides for this game!
https://www.youtube.com/playlist?list=PL-HeW6XkKdUKCPof8gLhv...