offline firefight coop surpports online 16 players, system link 16, and 4player split screen.
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You can get 43 achievements offline on halo 3 im not sure on odst.
No. ODST doesn't have multiplayer, excluding firefight (which can't be forged, and not even for matchmaking) and co-op campaign. But ODST does come with a Halo 3 multiplayer disc, which includes all of the original multiplayer maps and the DLC maps. That disc also includes forge mode.
well it depends what halo it is, if it is ODST then it should be simple and you read the manual and follow those instructions or do not sign in another controller. for REACH you just turn off all controllers sign in and it should take it from there If you are speaking of playing in Reach's firefight Solo, there is a selection in the main menu called "Firefight" choose this rather than going into "Matchmaking".
To obtain the activation code to unlock Sergeant Johnson for use in Firefight, you must of pre-ordered the game.
you get the multiplayer beta with odst but not the whole game it the beta comes out may 3rd 2010 halo 3 odst included also xbox live gold