Warhammer 40,000: Darktide

Boss spawn Is random through the missions, when u find It, what u have to do Is use your Charge ability when he use his charge and block It.

Bull Rush Is the name of the base ability used with that you have from lvl 1. When u reach the combat ability nodes u may Looser It if u choose another ability or upgrade It if u choose the Bull Rush upgrades on the left. I dont know if upgraded ability counts toward the achievement cause i used the base One.

Edit: The upgraded ability counts toward the achievement, no Need to use only the base ability