No, there is not.
There are no glitches, cheats or workarounds to earn all the achievements in Halo 3 illegitimately.
Actually, that doesn't work. To get all the achievements in Halo 3, you just have to work for them. I got 1575g just by working for them...there is, however, a way to get all 1750g in Halo 3 by manipulating your gamerscore, but that's a bit more complicated.
say youe gay x3 then erase you files and u will have all of the achievments
There is no glitch.
I do want to get all the achievements but i have xboxlive but can you tell me how to get all achievements in halo 3 in xboxlive.
The only way to get all the armor is by completeing the achivement or task online to get that sertain permutation.
you get all the vidmaster achievements on halo 3 and halo 3 odst
no no NO!!! earn them yourself, lazy
you need to achieve all the achievements. you need to achieve all the achievements.
Your work for them.
To get security armor in Halo 3... all you have to do is get all of the original 49 achievements (you don't need the new mythic or legendary achievements).
Here is a complete list of all Halo 3: ODST achievements: http://www.xbox360achievements.org/game/halo-3-odst/achievements/For tutorials/guides on how to do them, simply put the names (i.e. "All Ears," "I Like Fire.) into YouTube along with the keywords "Halo," "ODST" and "guide", and you should be good.