- Overcomeing Engineers
To quickly defeat an Engineer, use the Covenant pistol. Fully charge it to kill Engineers with one shot. This works in both Campaign and Firefight mode.

- Easy 'Vidmaster Challenge: Classic' achievement
Play Mission 3: Uplift Reserve, and get the Warthog at the beginning, then load it up with Marines. Shots fired from the Marines do not count against the achievement, but you cannot use the e-brake or horn. Just try to go through the level as quick as possible.


Play Mission 3: Uplift Reserve, and hijack a Ghost (recommended because of the boost ability) or Brute Chopper right away. Get past the Wraiths, and continue to the next area. Run over as many Covenant as possible, and go to the next area with all the Shade Turrets. There is a Shade Turret all the way to the left. If you have the Ghost, you can drive behind it on the cliff wall. Boost into the turrets; it should only take down your stamina. Recharge your stamina, and continue this process to destroy all the turrets and Covenant. Proceed further into the mission. At a current point you should hear the colonel talk about the 'asset' that they must retrieve. The next part may require a few attempts. Drive around all the enemies and Wraiths, and enter the tunnel. Continue the rest of the mission by outrunning the enemies. Notice: Remember to stay in cover.


There is a slightly faster and bit easier way to get the 'Vidmaster Challenge: Classic' achievement on Mission 3: Uplift Reserve. When you get around the first corner from the begining point, there is a small battle going on between a Wraith and a few smaller Covenant vehicles firing on a squad of UNSC forces. Hijack a Ghost from that area, and boost all the way to the end of the level. The boost on the Ghost does not count as firing a shot. If your Ghost is getting destroyed, there is a new one on the other end of the bridge you cross as the Space Elevator collapses. Also, you can climb the hill just after this location using the boost feature, instead of going along the path and getting shot at by the two Shade emplacements. Notice: E-braking and honking the horn with the Warthog counts against you.

- Recon armor
Unlock the 'Vidmaster Challenge: 7 on 7', 'Vidmaster Challenge: Brainpan', 'Vidmaster Challenge: Annual', and 'Vidmaster Challenge: Lightswitch' achievements in Halo 3. Unlock the 'Vidmaster Challenge: Classic', 'Vidmaster Challenge: Deja Vu', and 'Vidmaster Challenge: Endure' achievements in Halo 3: ODST. Then, go to Bungie.net to get a download code to unlock the Recon armor in Halo 3: ODST. Notice: You will need a valid and linked Bungie.net account to get the download code.

- Hidden credits sequence
During 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.

- Avatar Awards
Successfully complete the indicated task to unlock the corresponding Avatar Award:

ODST Hoodie	Unlock the 'Dark Times' achievement.
ODST Helmet	Unlock the 'Campaign Finish' achievement.
ODST Shirt	Unlock the 'Tourist' achievement.
ODST Armor	Unlock the 'Good Samaritan' achievement.
Recon Helmet	Unlock the 'Vidmaster Challenge

- Skull locations
Enter Forge mode on the Multiplayer disc. Load one of the following maps, and use flying camera mode to reach the Skull location. Once you find a Skull, position yourself above it, toggle out of flying camera mode, and keep pushed the button you have mapped for picking up weapons (default is RB). Your character should fall past the skull and pick it up on the way down. If you miss it, simply try again.


Citadel





Heretic





Longshore




- Bonus Firefight characters
Successfully complete the indicated task to unlock the corresponding character in Firefight mode:

Dutch	Successfully complete Mission 3
Buck	Successfully complete Mission 2
Dare	Successfully complete Campaign mode on the Legendary difficulty.
Romeo	Successfully complete Mission 6
Mickey	Successfully complete Mission 4
UNSC Sergeant Avery Johnson	Requires a unique pre-order code.

- Achievements
Do the following things to obtain the corresponding Gamerscore points:

5 Points
Listener	Find the first Audio Log.
Tourist	Access and download the city map to your VISR.
Dark Times	Kill 5 enemies while using VISR mode.
Dome Inspector	Get 15 headshot kills on NMPD HQ
My Clothes!	Plasma Pistol Overcharge and qucikly kill 10 Brutes.
Ewww, Sticky	Get 5 sticky grenade kills in any level.
Headcase	Finish any level with at least one Skull activated.
Trading Down	Trade weapons with a fellow character
Heal Up	Find the first Medical Kiosk and heal yourself.
Boom, Headshot	Get 10 automag headshot kills in any level.
Wraith Killer	Kill are Wraiths in Uplift Reserve
I Like Fire	Kill 10 enemies with the Flamethrower on Data Hive.
Pink and Deadly	Get 10 Needler supercombine kills on any covenant
Both Tubes	Get 10 Rocket kills on Kizingo Boulevard.
Laser Blaster	Get 10 Spartan Laser kills on ONI Alpha Site.
Stunning!	Stun a vehicle with an overcharged plasma pistol and quickly kill the driver
Naughty Naughty	Killing things that are new and different is good, alone or with another ODST.
10 Points
Firefight	Be victorious indward
Super Sleuth	Find the final clue unraveling the mystery, alone or with another ODST.
Firefight	Crater
Firefight	Alpha Site
Firefight	Rally Point
Be Like Marty	In Firefight, finish a full round without lilling a single enemy.
Firefight	Last Exit
Firefight	Chasm Ten
Gumshoe	Find the 3rd clue unraveling the mystery, alone or with another ODST.
Firefight	Lost Platoon
Firefight	Security Zone
Junior Detective	Find the first clue unraveling the mystery.
15 Points
Tuned In	Find 3 Audio Logs, alone or with another ODST.
20 Points
Good Samaritan	Killing things that are new and different is bad, alone or with another ODST.
25 Points
Vidmaster Challenge	Endure
Vidmaster Challenge	Classic
Vidmaster Challenge	Déjà Vu
30 Points
All Ears	Find 15 Audio Logs, alone or with another ODST.
Tayari Plaza	Finish Tayari Plaze on Normal, Heroic, or Legendary to unlock a new Firefight character.
Kizingo Boulevard	Finish Kizingo Blvd. on Normal, Heroic, or Legendary to unlock a new Firefighter character.
Kikiwani Station	Finish Kikowani Station on Normal, Heroic, or Legendary.
Uplift Reserve	Finish Uplift Reserve on Normal, Heroic, or Legendary to unlock a new Firefight character.
NMPD HQ	Finish NMPD HQ on Normal, Heroic, or Legendary to unlock a new Firefight mission.
ONI Alpha Site	Finish ONI Slpha Site on Normal, Heroic, or Legendary to unlock a new Firefighter mission.
50 Points
Coastal Highway	Finish Coastal Highway on Normal, Heroic, or Legendary to unlock a new Firefighter mission.
Data Hive	Finish Data Hive on Normal, Heroic, or Legendary to unlock a new Firefighter mission.
75 Points
Audiophile	Find all Audio Logs, alone or with another ODST.
100 Points
Campaign Finish	Legendary
Campaign Finish	Heroic
Campaign Finish	Normal

- Finding Audio Logs
If you have completed the game and are having trouble finding the remaining Audio Logs, when searching for Audio Logs, electronic devices such as pay phones, ticket booths, cars, cross walks, and anything tied to the Superintendent or city will go off basically announcing there is an Audio Log around waiting to be collected. Always be on the look out for the yellow glow in VISR mode on one of these things to find the Audio Logs. -From: Daniel Walker


The units you can get Audio Logs from in the Mombasa Streets all have a picture of the Superintendent on them (the green smiley with white eyes and no mouth).

- Easy 'My Clothes!' achievement
Get a Plasma pistol. Use an overcharged shot to destroy a Brute's shields, then use the silenced pistol to get a headshot. This works for Jackals as well; use the overcharged shot to disable their hand held shield, and then shoot them in the head to help you get the achievement. -From: Graeme Todd

- ODSTs compared to Spartans
Spartans are 'half human, half machine' as noted by Bungie. Orbital Drop Shock Troopers (ODSTs) are basically ordinary Marines, only they are highly trained, but they are not like Spartans. Bungie made a mistake by making the player slightly like Spartans for a few reasons. In the game, you are as tall as a Spartan when you are standing next to an ODST squad mate. You can wield a Gravity Hammer, which the only ones known to actually wield them are Spartans and Brutes, not ODSTs. You can melee Brutes to death, while only Spartans can do that. The melee attacks performed by people with lower ranks than Spartans do not affect Brutes at all.

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

- Easy 'Both Tubes' achievement
Before boarding the Scorpion, give your rocket launcher to any Marine riding in the tank. Notice: You can also pick up the other rocket launcher from behind the tank and hand it off as well. Any kill the Marine makes counts toward the achievement. The Marine has infinite ammunition, which makes getting the 'Both Tubes' achievement much easier.

- Finding secret doors
While in VISR mode, look for secret doors. 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.

- Easy 'Vidmaster Challenge: Déjà Vu' achievement
Play on the Legendary difficulty with the Iron Skull activated. Two Mongooses which you can use as transport will appear inside the first open tunnel you can walk into after begining on the highway. Also accompanying the Mongooses are four rocket launchers with 999 shots. Take each part of the highway slowly, and make sure to cover Dare when she gets overwhelmed.

- Bonus Firefight missions
Successfully complete the indicated task to unlock the corresponding mission in Firefight mode:

Alpha Site	Successfully complete Mission 5
Last Exit	Successfully complete Mission 9
Chasm Ten	Successfully complete Mission 8
Lost Platoon	Successfully complete Mission 3

- Halo 2 reference
In the 'Prepare To Drop' tutorial mission, when the Carrier jumps to Slipspace Rupture, look closely at the right of the Carrier. You will see the Amber Clad of Commander Keyes getting into the Slipspace Rupture along with the Carrier. In Halo 2, during the end of the 'Metropolis' mission cutscene, you will see the Amber Clad of Commander Miranda Keyes to the right of the Carrier entering the Slipspace Rupture along with the Carrier. This is definitely a reference to Halo 2 for a couple of reasons. Halo 3: ODST takes place in New Mombasa, and the Carrier is floating next to the space elevator. In Halo 2 you are also in New Mombasa, and at the beginning of the level on the bridge, you can see the space elevator and the Carrier floating next to it. In both Halo 3: ODST and Halo 2, when the Carrier jumps there is a big EMP wave.

- Finding the final Audio Log
The 30th (last) Audio Log for Sadie's Story is in Mission 8: Date Hive. However, it is in a locked area until you find the other 29 Audio Logs in the Mombasa Streets. Once you collect the 29 Audio Logs, play Mission 8: Date Hive until you reach the hole to get to Sub-Station 9. Instead of the Superintendent closing off the hole so your teammate cannot get through (and ultimately get killed by Drones), he will climb down the hole with you. Continue playing until your teammate 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 Log. Notice: Finding the Audio Log will slightly alter the scene, specifically the part where Dare and the Rookie find 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.