You managed to save Dr. Kavanagh and all the prisoners, too.
After Burke attempts to kill Kavanagh and the prisoners with the gas, you will be given the option to save one or the other. If you are doing a Factory Zero playthrough, save now. Pick up a gun, or equip one if you already have one in your inventory. Take the Cybernetic Leg Prosthesis and Move/Lift Heavy Objects augmentations and find a large box covering a vent on the outside wall. Follow the path and it will lead to a generator with a small green tank on the front. Shoot the tank and you will save everyone and get the achievement, but to get Factory Zero you will need to reload your save and choose one or the other.
i take back what i said, you can do both, however the above video is not the way to do it, he used a praxis to upgrade his arm str. as i stated in my previous comment, however you can get the achievement through: http://www.youtube.com/watch?v=CF6VUnMvbqA
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