Hope this request isn't too basic, but i couldn't find any clue via google or search-function.
I have a lot of trouble with Boss 6 - I do neither understand how to actually harm her during her final phase, nor could I unlock the achievement for it. I'm Shooting, dodging, switching, dying - and after a few minutes her lifebar depletes completely (and fast, As well!), then She screams, bleeds and dies.
