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No, in Halo 2 you can not unlock armor.
go to http://hubpages.com/hub/Halo-3-Armor
The only way to get all the armor variants is to unlock the achievement for that armor or meet a certain requirement. For example getting all the skulls on the campaign unlocks the hayabusa armor variant for your spartan. Also beating the game on diffrent difficulties unlocks new armor sets for you.
To unlock Recon armor in Halo 3, you originally had to beat all of the VidMaster achievments, but the armor is now available to all players. To unlock the recon armor in Halo: Reach you had to pre-order the game and you would get a long (25 character) code for the recon armor DLC. To unlock the recon armor in Halo 4, you had to either pre-order the game or simply buy the armor with your in-game credits.
All pieces of armor require a specific in-game medals to unlock. (Like overkill or a four kill streak) The only armor that doesn\'t need a medal to unlock is a type of armor with a Japanese name that I can\'t remember. To get that you need to play on Legendary and gather all 13 skulls in campaign.
you buy it and you can unlock some by halo waypoint (free download)
Get some skulls dummy
I'm sorry bud but there isn't a cheat code to unlock all the armour in Halo. PERIOD.
There is two ways to get it #1 unlock all of the armor #2 is to become the highest rank in halo reach
There isn't a known cheat code for this on Halo 3.
no just work for the armor
there is no permanent cheats in halo 3. you need to unlock them by achievments. and, you can not get the flaming armor effect, it is only for bungie employees. in halo reach, buy the legendary package to get that armor effect.