For Light...some handy macros that mark the mobs to make sure they are all up on the Full House achievement you're after:
/cleartarget
/targetexact Reanimated Fanatic
/stopmacro [noexists]
/run SetRaidTarget("target",1)
/cleartarget
/targetexact Cult Fanatic
/stopmacro [noexists]
/run SetRaidTarget("target",2)
/cleartarget
/targetexact Deformed Fanatic
/stopmacro [noexists]
/run SetRaidTarget("target",3)
/cleartarget
/targetexact Reanimated Adherent
/stopmacro [noexists]
/run SetRaidTarget("target",4)
/cleartarget
/targetexact Cult Adherent
/stopmacro [noexists]
/run SetRaidTarget("target",5)