No.
Just like Xbox, you need a Live Account. It should be pretty self explanatory by going to the Microsoft website and clicking on live games.
Yes. An Xbox Live Gold Subscription is required to play Halo 3's multiplayer.
on an xbox press multiplayer
yes
Halo 2
yes everything except multiplayer
There is multiplayer in halo 4
Yes that's the purpose of the multiplayer disk. the odst disk has online multiplayer to.(4 player co-op campaine and fire fight)
Becuase it has amazing graphics and it is multiplayer and of course its online
If you want every achievement then yes.
Yes, Halo Wars is a Xbox Live game, therefore you can play online against other players.
Yes, it's a remake of Halo: CE with the remade maps, with online multiplayer, and the remastered campaign.
Only local multiplayer. Online? No.