Completing missions in Campaign,playing online, the rest you can find out if you hold down the giant X button in the middle of the controller then going left until you see ''Acheivements'' and see Halo 3 Acheivements.
1000 gamerpoints gives you the katana, not the security armour.
Nope.
you gut some
you have to go to halo3 mods .com on google and click on halo3 how to mod
Their isn't any cheats for Halo3
in my opinion halo 3odst
No, you will not. All gamerpoints earned will stay the same. No matter if you were offline or online its on the profile.
Halo3:O.D.S.T. come out on September 22nd
No you do not have to have halo3 to get halo3 odst.I have heard a few bad reviews of it but most are good so i suggest people should get it.
well first you have to have xbox live and win a bunch of matches. i have all the armor b you get katana by getting 1000 gamerpoints in halo 3 same with security helmet. you get haybusa by finding all the skulls. eod by completing the campaign on legendary markv by reaching sergent in xboxlive. same with odst. and that's all i know
No. (360)
nothing there gust thing to collect like stamps