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I disconnected my internet, then restarted my computer, then started steam in offline mode, and the game works just fine. The only thing is, it takes about 20 seconds or so of that little loading circle. Oh, and also it takes about 30 seconds to exit the game, which seems like it crashes the .exe, but eventually it shuts down (I think that's a bug).
Obviously, I can't confirm whether it would work, if you hadn't signed into xbox live in a couple of weeks
But other than that, yes, it can be played offline.
If you run into problems I can say that the original xbox and xbox360 never required any login to play the halo games at least for me, I am not sure about xbox one or the PC version.