"Slow Jo" not unlocking
Exactly what it says, I'm using slow-mo and killing 5 or more enemies and its not unlocking. I've done it at multiple places in the campaign (i.e. first turret section, final ghost ambush) over and over again and its just not happening for me. Anyone had a similar experience or know any reason why it won't unlock?
Multiplayer achievements are the bane of my life.