How do you unlock armor on halo3 odst?

There is no armor for Halo 3:ODST, you only unlock Firefight characters. To unlock the said characters, you must complete the story line (the characters you play as during the particular clue you find is the character you will unlock upon completion). The last character is unlocked by beating the game on Legendary (this is DARE, which is the female in the game).

However, unlocking the 3 Vidmaster achievements in Halo 3:ODST (Endure, Classic, and Deja Vu) along with the 4 Vidmaster achievements from Halo 3 (Lightswitch, Brainpan, 7 on 7, and Annual) you will enable the use of the Recon Armor in Halo 3 Multiplayer.

I'm not entirely sure which armor you mean for Halo 3: ODST, but I found this instructional video on the subject.

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