How do you get all the armor parts in Halo 3?

[corny#73]

I want to get all of the customizable parts when you create your own spartan. How do I unlock them.

 

[Jason T]

security helm:get 1k gamerpoints in halo 3
security shoulders:get marathon man or unknown
hayabusa helm:get all skulls
hayabusa body:get 3 skulls or something
hayabusa shoulders get like 6 skulls
katana:get 1k gamerpoints
eod helm:complete game on legendary
eod shoulders:complete the ark on legendary
eod body:complete tsavo highway on legendary
eva HELM:complete game on normal
eva shoulders:complete ark on normal
eva body:complete tsavo highway on normal
cqb and mark vi:default get at beggining
i think thats all i know for spartan
rouge:get lieutenant on xbox live.
ELITE

first two default
3rd i dont know name but i think for helm complete game on heroic,shoulders do ark on heroic,and body do tsavo highway on heroic

and i think a part of commando is if u get overkill
please tell me this is best answer

 

[Miguel F]

You have to unlock certain/or all the achievements.