This is a pretty simple one and can be done on Blood of The Dead.
Have a buddy near by and keep hitting the box until you get the Blundergat, once it appears press the right analogue stick which allows your friend to pick it up. Once they have picked it up your achievement will pop.
** EDIT **
This can be done with any of the main wonder weapons from the box.
Blood of the Dead: Blundergat
IX: Death of Orion (Has to be built first)
Voyage of Despair: Kraken
Classified: Winters Howl