thanks to some recent videos and screenshots i was able to collect some of the level names of halo. just add what i missed.
"I Would Have Been Your Daddy": schwartzenegger shot level
"The Silent Cartographer": beach landing, this must have something to do with the device down in the covenant infested "base"(the shaft?). does the hologram belong to this?
"Reveille": first level on the PoA, awakening from cryo sleep
"The Maw": huge snow level
"The Pillar of Autumn": obvious
difficulty level:
easy:
"Your foes cower and fail before your unstoppable onslaught, yet final victory will leave you wanting more."
normal:
"Hordes of aliens vie to destroy you, but nerves of steel and a quick trigger finger give you a solid chance to prevail."
heroic:
"Your enemies are as numerous as they are ferocious; their attacks are devastating. Survival is not guaranteed."
legendary:
"You face opponents who have never known defeat, who laugh in alien tongues at your efforts to survive. This is suicide."
so far.