DLC maps are not required, however this trophy didn't pop until I finished Lab Rats
on Death Wish. That is an event though, so you'd think that in that case you need all events as well for this trophy, right? NOPE! I never played Prison Nightmare which is the other event. So be aware of this.
Good news though, the difficulty specific trophies, so Shit just got real
, Tough act to follow
, Completely OVERKILL!
and this one, OVERKILL Salutes You!
stack. I only did them on Death Wish and I unlocked all these trophies at once (and my Platinum too