This page contains Halo 3: ODST Unlockables for Xbox 360 called "Cidmaster achievements" and has been posted or updated on Sep 19, 2009 by game chicken. Let us know what you think of this Unlockable by thumbs voting.
Deja Vu- you complete Coastal Highway on 4-player Legendary Live co-op, with Iron skull activated, and not using the Warthog or Scorpion at all. It is worth 25 points.
Endure-it is unlocked when you play on Firefight, on any mission, and pass the 4th set (the 12th round and 60th wave) on 4 player Heroic co-op Live. It is worth 25 points.
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