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  Halo 3: ODST [Xbox 360]
Unlockables

Firefight mode: Missions
Complete the indicated mission in Campaign mode to unlock the corresponding
Firefight mode mission.

Alpha Site: Complete the ONI Alpha Site mission.
Chasm Ten: Complete the Date Hive mission.
Last Exit: Complete the Coastal Highway mission.
Lost Platoon: Complete the Uplift Reserve mission.

Firefight mode: Recon Armor
To unlock DARE's Recon Armor, complete Campaign mode under the Legendary difficulty.

Recon Armor
Unlock the seven "Vidmaster challenge" achievements in both Halo 3 and Halo 3: ODST. Then, flip the switch on your Bungie.net service record (look for the "Road to Recon" under your trophy shot). Note: You will need a valid and linked Bungie.net account to complete the required steps.

Jason Lozy
Firefight mode: Characters
Complete the indicated task to unlock the corresponding character for Firefight mode.
Buck: Complete Tayari Plaza under the Normal or higher difficulty.
Dare: Complete the Campaign under the Legendary difficulty.
Dutch: Complete Uplift Reserve under the Normal or higher difficulty.
Mickey: Complete Kizingo Boulevard under the Normal or higher difficulty.
Romeo Character: Complete NMPD HQ under the Normal or higher difficulty.

Epilogue video
Successfully complete the game and do not interrupt the credits. The Epilogue video will begin playing after the credits end.


Defeating Engineers
In order to take down an Engineer quickly, use the Covenant pistol. Fully charge it to take down Engineers with one shot. This applies to both Firefight, and Campaign modes.

Finding secret doors
While using VISR mode as the Rookie, look out for secret doorways. Accessible doors will turn the amber outlines of objects in front of them blue. This is easiest to see on your weapon. Watch for them because many of these doors hide data terminals.

Data Hive: 30th audio file
The 30th (last) audio file for Sadie's Story is not in the "Mombasa Streets" but rather in the "Data Hive" level (also played by the Rookie). However, it will be in a locked area until you find the 29 audio files in the Mombasa Streets. Once you find those files, play the mission "Data Hive" until you reach the hole to get to Sub-station 9. If you found the previous files, instead of the Superintentation closing off the hole so your cop teammate cannot get through (and ultimately get killed by Drones), he will climb down the hole with you. Continue playing until the cop says something similar to "Wait here, I need to go check something." Follow him and he will reveal his true purpose for coming here and will fight you. During or after the fight, you can scan the phone on the wall next to the dead body to find the 30th audio file. Note, finding the audio file will slightly alter the scene, specifically the part where DARE and the Rookie finds Vergil. Instead of DARE telling the Rookie not to shoot, the Rookie will tell DARE not to fire and instead whistle for Vergil to come out.

Hidden credits sequence
While viewing the ending credits press Right Analog-stick Left. Do this until the camera pans over to the left of the screen to see Buck playing with one of the weird monkeys from Halo 3.

Easy "Vidmaster Challenge: Déjà Vu" achievement
Play under the Legendary difficulty setting with the Iron Skull on. Two Mongooses you can use as transport will appear inside the first open tunnel you can walk into after starting on the highway. Also accompanying the Mongooses are four rocket launchers with 999 shots. Take each piece of highway slowly and make sure to cover DARE when she gets overwhelmed.




Achievements
Complete the following achievements to unlock Xbox Live Gamerscore points.

Heal Up (5 points): Find the first Medical Kiosk and heal yourself.
Tourist (5 points): Access and download the city map to your VISR.
Dark Times (5 points): Kill 5 enemies while using VISR mode.
Boom, Headshot (5 points): Get 10 automag headshot kills in any level.
Stunning! (5 points): Stun a vehicle with an overcharged plasma pistol and quickly kill the driver
Ewww, Sticky (5 points): Get 5 sticky grenade kills in any level.
My Clothes! (5 points): Plasma Pistol Overcharge and qucikly kill 10 Brutes.
Pink and Deadly (5 points): Get 10 Needler supercombine kills on any covenant
Trading Down (5 points): Trade weapons with a fellow character
Headcase (5 points): Finish any level with at least one Skull activated.
Tayari Plaza (30 points): Complete Tayari Plaze on Normal, Heroic, or Legendary to unlock a new Firefight character.
Uplift Reserve (30 points): Complete Uplift Reserve on Normal, Heroic, or Legendary to unlock a new Firefight character.
Kizingo Boulevard (30 points): Complete Kizingo Blvd. on Normal, Heroic, or Legendary to unlock a new Firefighter character.
ONI Alpha Site (30 points): Complete ONI Slpha Site on Normal, Heroic, or Legendary to unlock a new Firefighter mission.
NMPD HQ (30 points): Complete NMPD HQ on Normal, Heroic, or Legendary to unlock a new Firefight mission.
Kikiwani Station (30 points): Complete Kikowani Station on Normal, Heroic, or Legendary.
Data Hive (50 points): Complete Data Hive on Normal, Heroic, or Legendary to unlock a new Firefighter mission.
Coastal Highway (50 points): Complete Coastal Highway on Normal, Heroic, or Legendary to unlock a new Firefighter mission.
Campaign Complete: Normal (100 points): Complete the Campaign on Normal difficulty.
Campaign Complete: Heroic (100 points): Complete the Campaign on Heroic difficulty.
Campaign Complete: Legendary (100 points): Complete the Campaign on Legendary to unlock a new Firefight character.
Junior Detective (10 points): Find the first clue unraveling the mystery.
Gumshoe (10 points): Find the 3rd clue unraveling the mystery, alone or with another ODST.
Super Sleuth (10 points): Find the final clue unraveling the mystery, alone or with another ODST.
Wraith Killer (5 points): Kill are Wraiths in Uplift Reserve
Both Tubes (5 points): Get 10 Rocket kills on Kizingo Boulevard.
Laser Blaster (5 points): Get 10 Spartan Laser kills on ONI Alpha Site.
Dome Inspector (5 points): Get 15 headshot kills on NMPD HQ
I Like Fire (5 points): Kill 10 enemies with the Flamethrower on Data Hive.
Good Samaritan (20 points): Killing things that are new and different is bad, alone or with another ODST.
Naughty Naughty (5 points): Killing things that are new and different is good, alone or with another ODST.
Listener (5 points): Find the first Audio Log.
Tuned In (15 points): Find 3 Audio Logs, alone or with another ODST.
All Ears (30 points): Find 15 Audio Logs, alone or with another ODST.
Audiophile (75 points): Find all Audio Logs, alone or with another ODST.
Be Like Marty (10 points): In Firefight, finish a full round without lilling a single enemy.
Firefight: Crater (10 points): Score over 200,000 points in Firefight on Crater.
Firefight: Lost Platoon (10 points): Score over 200,000 points in Firefight on Lost Platoon.
Firefight: Rally Point (10 points): Score over 200,000 points in Firefight on Rally Point.
Firefight: Security Zone (10 points): Score over 200,000 points in Firefight on Security Zone.
Firefight: Alpha Site (10 points): Score over 200,000 points in Firefight on Alpha Site.
Firefight: Windward (10 points): Score over 200,000 points in Firefight on Windward.
Firefight: Chasm Ten (10 points): Score over 200,000 points in Firefight on Chasm Ten.
Firefight: Last Exit (10 points): Score over 200,000 points in Firefight on Last Exit.
Vidmaster Challenge: Classic (25 points): Finish any level solo on Legendary, on LIVE, with no shots fired or grenades thrown.
Vidmaster Challenge: Endure (25 points): In Firefight, on any mission, pass the 4th Set on 4-player Heroic LIVE co-op.
Vidmaster Challenge: Déjà Vu (25 points): Complete Highway on 4-player Legendary LIVE co-op, with Iron, and no 'Hog or Scorpion.

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