In Episode 1, in the Citadel core there are 2 stalkers. They fire a laser at the energy ball receptacles, resetting them. All you need to to get the achievement is not kill them for your convenience. Sounds easy right? Well, it actually is.
Generally, at any given point in the room only 2 receptacles are within your view. You need these two to activate the bridges between the islands. Once you know your targets, quickly grab an energy ball and fire it into a receptacle and then quickly grab another and fire it into the other one. Now dash across the bridge.
The stalkers will ignore you there, so no worries about your safety. Repeat as needed.
Please note that these are the only 2 you don't have to kill at all. The rest you can go nuts on.