In order to unlock Anarchy's Executioner, you have to defeat every boss with your Killer Weapon. It doesn't matter if you use a weak or strong attack, just so long as your holding the right trigger to activate your "Killer Weapon." You'll not you got it when you get an Overkill! +10000 bonus with your final hit.

Embark on an inspiring mission of human connection beyond the UCA. Sam — with companions by his side — sets out on a new journey to save humanity from extinction. Join them as they traverse a world beset by otherworldly enemies, obstacles and a haunting question: should we have connected?