Unlocking Halo 3 armor

Body Pieces Spartan EVA.................Complete Tsavo Highway on Normal, Heroic, or Legendary EOD.................Complete Tsavo Highway on Legendary (addition from our reader Kyle: you do not unlock EOD armor body from beating tsavo's highway on legendary. I just beat it and it only unlock EVA)

Scout...............Unlock "Too Close to the Sun" Achievement (Destroy an enemy banshee with the Sp'laser or missile pod in a ranked playlist or campaign) Elite Flight...............Complete Tsavo Highway on Heroic or Legendary Ascetic............Unlock "Up Close and Personal" Achievement (Kill 5 enemies via melee or assassination in a ranked FFA playlist) Commando....Unlock "Triple Kill" Achievement (Get one triple kill)

Shoulder Pieces Spartan EVA.................Complete The Ark on Normal, Heroic, or Legendary EOD................Complete The Ark on Legendary Security..........Earn 750 Gamerscore Points Scout...............Unlock "We're in for some Chop" Achievement (Destroy an enemy vehicle with a piece of equipment in a ranked playlist or campaign) Elite Flight...............Complete The Ark on Heroic or Legendary Ascetic............Unlock "Overkill" Achievement (Get one overkill) Commando....Unlock "Killing Frenzy" Achievement (Get one killing frenzy)

Head Pieces Spartan EVA.................Complete Campaign on Normal, Heroic, or Legendary EOD.................Complete Campaign on Legendary Security...........Earn 1,000 Gamerscore Points Scout................Unlock "Used Car Salesman" Achievement (Destroy an enemy vehicle containing 3 enemies in Campaign or ranked playlists) Mark V.............Unlock "UNSC Spartan" Achievement (Reach Sergeant ranking online) ODST...............Unlock "Spartan Graduate" Achievement (Earn 5 EXP or complete 10 ranked matches) Rogue.............Unlock "Spartan Officer" Achievement (Advance to the Spartan Officer ranks online) Elite Flight...............Complete Campaign on Heroic or Legendary Ascetic.............Unlock "Steppin' Razor" Achievement (Get one triple kill with an energy sword in ranked FFA) Commando....Unlock "Overkill" Achievement (Get one overkill)