Lasers and Magnets and Drills! Oh My!

In order to get this achievement, you'll need to never kill a particular weapon over the course of the entire fight. This achievement doesn't have to be completed in one kill, so a simple way of getting it is by assigning one weapon which will never be killed on the conveyor belt. There's four different weapons, and there's always at least two different weapons on any conveyor belt. Following this tactic, you should have your achievement within four weeks.

There is a way to get this achievement in one kill, and I would only recommend doing this on flex. With semi-decent gear, you should be able to completely ignore the conveyor belt. Because nobody will never go up, no weapon will ever be killed, and thus, all four conditions of the achievement will be fulfilled. However, the boss will get a 90% damage reduction shield every time no weapon gets killed (hence the recommendation to only try this on flex).

extremely easy in WoD, just nuke the boss without anyone getting on the conveyor belt.

Considering the reference, I'm looking forward to a new chant.