take cover, use your ally(s) , and don't rush. :)
Yes
Yes
Beat the game on legendary
beat campaign on legendary
No it does not. You have to beat every level.
well what you do is beat all levels on halo 3 then you get the cool armor
No but it will help unlock the katana.
you buy them on xbl marketplace, it has nothing to do with beating it.
You get an achievement and if you have halo waypoint, you get the CQB helmet. Well you actually get it on heroic but you get what I'm saying. You also get an attachment if you've completed halo 3 on legendary too. Hope this helps!
I do not think that anybody can beat Halo 3 on legendary difficulty for the same reason i think people cant just pick up a gutair on gutiair Hero and play on expert it takes years of practice to reach the rank of legendary i Nick Thivener have beaten it on legendary
I don't think that Halo 3: Legendary Edition is a game.
you have to complete halo 3 odst on legendary, have xbox live and complete halo 3 on legendary