So I've been through watching the videos on YouTube to find out how to do this ball-buster of an achievement. Me and a friend thought we'd try out doing it two player seeing as it's been proven that it's possible.
We finally got the Avogadro under the pylon and killed him with the galvaknuckles in the hope that he would travel up the pylon and we could continue. But he didn't go up!
Does he have to be killed with the EMPs? Are we really expected to repeatedly try again until we get the EMPs out of the box? Seriously?