What can you do on Halo 3 after you have beaten the campaign?

[danno0814]

Like what else can you do, and by the way, you know how you get Acheivents on Xbox 360, what do they do?

 

[Anubis512]

xbox live, xbox live, xbox live.

it's all about playing other people

 

[sniper7792]

Play xbox live.

 

[spartan2262]

You can fight new poeple at X-Box live and each time you'll have a new battle. And you might find some downloads for new maps there. Hope that helps some.