No. I tried to find out if you could but you cant. I was stuck on mission Cortana.
well what you do is beat all levels on halo 3 then you get the cool armor
you hav 2 complete the game
Play through the campaign levels on normal and you will be able to unlock them. The one firefight character you will not be able to unlock is Sgt. Johnson. In order to unlock him you will need to pre-order Halo 3 ODST.
you cant without mods :(
you cant
It is a helmet you unlock after a certain period of time playing.
If by "halo 3 maps" you mean the Halo 3 Heroic, Legendary, Mythic and Cold Storage maps, then yes. However to play campaign levels, you must actually advance in the game to get to them.
You can play through each difficulty and unlock the achievement for it, playing on Legendary will unlock Hard and Normal Difficulty achievements retroactively without having to play through again
No but it will help unlock the katana.
yes you still unlock the armor. you and the player that your playing with unlock the armor. =] =) =p q=].
you find them,look for videos on Youtube I believe that you have to find them in different levels and speaking of halo 3 do you know if you can make scarabs in forge in any places?
No, luckily. Those playing Halo: Reach without Xbox Live are not restrained by the level cap; meaning, you can skyrocket all the way up to the highest rank! Also, you can unlock all of the armor types. However, if you acquire Live after playing Halo offline, if you try to play online, your credit-earing rate will severely decrease, and you will lose all of your new armor online.