No
when get achievements (like beating the game on Legendary or finding all the skulls) you can unlock some of the armor.
It depends. Certain suits or parts of armor are unlocked for getting achievements in campaign, finding skulls, and whatnot. Some are obtained through the multiplayer, either from ranking up or getting an online achievement.
you buy it and you can unlock some by halo waypoint (free download)
To get better at Halo 3, you need to play against people who are slightly better than you. Halo 3's on-line multiplayer mode has a ranking system that is geared to put you against players close to your own skill range, some better some worse. To unlock all of the armor, for both Spartan and Elite models, you need to complete achievements. Unfortunately, you still need to play the campaign mode to unlock all of the achievements.
Get some skulls dummy
have you completed the vid masters on halo 3 odst as well
some might get bored of halo and play w.o.w, but only if they don't have online halo 3. they also get bored of w.o.w and start playing halo 3 online.
You have to have Xbox Live to have the katana. As some of the 49 achievements are online. All i know is that my friend never had live and got the katana...soooo all i gots to say is get all the achievements that dont involve live and u should get it :)
go to youtube and type in halo 3 skull hunting and there will be some videos telling you how
I posted this question but i forgot to say my gamer tag is antone808.
There are two ways to get the "Katana" sword in Halo 3: Get 1,000 Gamerpoints in Halo 3 or get 49 out of 79 achievements in Halo 3. I recommend that you finish campaign on Legenday first (so you already have a lot of gamerpoints. It is frustrating, but it is worth it.) Then, just play the Legendary and Mythic Map Pack and get the Achievements there (most are about 25Gs but some are 50Gs.) Good luck! You can Also get it by getting 50 EXP points in one playlist on Matchmaking (Online)
Simply, you can't. Halo Zero has to be downloaded. So far nobody has found a way to put it online (I think, but there may be some other better answers).