Skull239,109 Locked 22 Oct 2015 23 Oct 2015
You must kill 250 Blade Dancers to earn the fourth tier of this achievement.
These guys can be found just outside the point you spawn at Midway plains. Their AI is very poor, so take a melee weapon and start whacking away!
Progress can be sped up by doing it in the party as party kills count towards the achievement.