- Rookie
H3: ODST: Complete every level of the game on Easy difficulty.
- Urban Warfare Badge
H3: ODST: Complete every level of the game on Normal difficulty.
- Coastal Highway
H3: ODST: Complete Coastal Highway.
- Data Hive
H3: ODST: Complete Data Hive.
- Overtaken By Events
H3: ODST: Beat the par time on Data Hive.
- Kikowani Station
H3: ODST: Complete Kikowani Station.
- Secret Agent
H3: ODST: Find the 6th clue unravelling the mystery.
- NMPD HQ
H3: ODST: Complete NMPD HQ.
- Private Eye
H3: ODST: Find the 5th clue unravelling the mystery.
- Kizingo Boulevard
H3: ODST: Complete Kizingo Blvd.
- Gumshoe
H3: ODST: Find the 3rd clue unravelling the mystery.
- ONI Alpha Site
H3: ODST: Complete ONI Alpha Site.
- Bloodhound
H3: ODST: Find the 4th clue unravelling the mystery.
- Uplift Reserve
H3: ODST: Complete Uplift Reserve.
- Deference of Darkness
H3: ODST: Complete any level without activating VISR mode.
25 July 2020 - 4 guides
- Investigator
H3: ODST: Find the 2nd clue to unravelling the mystery.
- Tayari Plaza
H3: ODST: Complete Tayari Plaza.
- Two Places, Same Time
H3: ODST: I've got my eye on you, Marine.
25 July 2020 - 3 guides
- Junior Detective
H3: ODST: Find the 1st clue to unravelling the mystery.
- Bip! Bap! BAM!
H3: ODST: Earn a Triple Kill medal with the pistol on any level.
25 July 2020 - 6 guides
- Pineapple Express
H3: ODST: Kill 4 enemies with a single plasma or frag grenade.
25 July 2020 - 5 guides
- Naughty Naughty
Kill 10 Engineers.
Locked - 2 guides
- Well...Maybe One or Two
Kill 25 Engineers.
Locked - 5 guides
- Listener
H3: ODST: Find the 1st Audio Log.
Locked - 3 guides
- An Earful
H3: ODST: Find the 2nd Audio Log.
Locked - 3 guides
- Tuned In
H3: ODST: Find the 3rd Audio Log.
Locked - 3 guides
- Do Tell
H3: ODST: Find the 4th Audio Log.
Locked - 3 guides
- Hear Me Out
H3: ODST: Find the 5th Audio Log.
Locked - 3 guides
- Eavesdropping
H3: ODST: Find the 6th Audio Log.
Locked - 3 guides
- Auditor
H3: ODST: Find the 7th Audio Log.
Locked - 3 guides
- Overheard
H3: ODST: Find the 8th Audio Log.
Locked - 3 guides
- Wiretapping
H3: ODST: Find the 9th Audio Log.
Locked - 3 guides
- Monitored
H3: ODST: Find the 10th Audio Log.
Locked - 3 guides
- Hang Onto My Words
H3: ODST: Find the 11th Audio Log.
Locked - 3 guides
- Give Heed
H3: ODST: Find the 12th Audio Log.
Locked - 3 guides
- Get A Load
H3: ODST: Find the 13th Audio Log.
Locked - 3 guides
- Snoop Troop
H3: ODST: Find the 14th Audio Log.
Locked - 3 guides
- All Ears
H3: ODST: Find the 15th Audio Log.
Locked - 3 guides
- Ear Bender
H3: ODST: Find the 16th Audio Log.
Locked - 3 guides
- Plugged In
H3: ODST: Find the 17th Audio Log.
Locked - 3 guides
- Attentive
H3: ODST: Find the 18th Audio Log.
Locked - 3 guides
- Watchful
H3: ODST: Find the 19th Audio Log.
Locked - 3 guides
- Observant
H3: ODST: Find the 20th Audio Log.
Locked - 3 guides
- Scout
H3: ODST: Find the 21st Audio Log.
Locked - 3 guides
- Adventurer
H3: ODST: Find the 22nd Audio Log.
Locked - 3 guides
- Spotter
H3: ODST: Find the 23rd Audio Log.
Locked - 3 guides
- Considerate
H3: ODST: Find the 24th Audio Log.
Locked - 3 guides
- On Your Toes
H3: ODST: Find the 25th Audio Log.
Locked - 3 guides
- Archivist
H3: ODST: Find the 26th Audio Log.
Locked - 3 guides
- Your Attention Please
H3: ODST: Find the 27th Audio Log.
Locked - 3 guides
- Catching On
H3: ODST: Find the 28th Audio Log.
Locked - 3 guides
- Wisening Up
H3: ODST: Find the 29th Audio Log.
Locked - 3 guides
- Audiophile
H3: ODST: Find the 30th Audio Log.
Locked - 6 guides
- First In, Last Out
H3: ODST: Complete every level of the game on Heroic difficulty.
Locked - 2 guides
- Mean Streets of New Mombasa
H3: ODST: Complete every level of the game on Legendary difficulty.
Locked - 2 guides
- Record Shop Owner
H3: ODST: Find all 30 Audio Logs.
Locked - 4 guides
- Bill Past Due
H3: ODST: Beat the par time on Tayari Plaza.
Locked - 3 guides
- Floor It!
H3: ODST: Beat the par time on Uplift Reserve.
Locked - 3 guides
- An Artist's Canvas
H3: ODST: Beat the par time on Kizingo Blvd.
Locked - 2 guides
- A Pleasant Trip
H3: ODST: Beat the par time on ONI Alpha Site.
Locked - 2 guides
- First Stop: Anywhere But Here!
H3: ODST: Beat the par time on NMPD HQ.
- Feet, Don't Fail Me Now
H3: ODST: Beat the par time on Kikowani Station.
- Double Time!
H3: ODST: Beat the par time on Coastal Highway.
Locked - 2 guides
- Can't Stop Here, This is Brute Country
H3: ODST: Beat par time on all Halo 3: ODST levels.
Locked - 3 guides
- Survey Says...
H3: ODST: Beat the par score on Tayari Plaza.
Locked - 2 guides
- Don't Strain Your Metaphors
H3: ODST: Beat the par score on Uplift Reserve.
Locked - 3 guides
- Son of a Gun
H3: ODST: Beat the par score on Kizingo Blvd.
- I Love My Job
H3: ODST: Beat the par score on ONI Alpha Site.
Locked - 4 guides
- Pour It On
H3: ODST: Beat the par score on NMPD HQ.
Locked - 3 guides
- Squid Jackpot!
H3: ODST: Beat the par score on Kikowani Station.
Locked - 5 guides
- Magic Touch
H3: ODST: Beat the par score on Data Hive.
Locked - 2 guides
- This Oliphant Has No Brakes
H3: ODST: Beat the par score on Coastal Highway.
Locked - 5 guides
- The Marine Corps Gives Its Regards
H3: ODST: Beat the par score on all Halo 3: ODST levels.
Locked - 2 guides
- Déjà Vu
H3: ODST: Complete Coastal Highway on 4-player Legendary co-op, with Iron and no 'Hog or Scorpion.
Locked - 4 guides
- Do You Remember When We Met
H3: ODST: Play a game of Halo 3: ODST on the 22nd of any month.
Locked - 4 guides
- Safety Not Guaranteed
H3: ODST: Complete a Halo 3: ODST LASO Campaign playlist.
Locked - 2 guides
- Trifecta
H3: ODST: Complete three Halo 3: ODST playlists.
Locked - 2 guides
- NEXT!
H3: ODST: Complete a Halo 3: ODST playlist.
Locked - 2 guides
- Nagato Makes Moving Easy
H3: ODST: Complete all Halo 3: ODST Legendary campaign missions in under 3 hours.
Locked - 4 guides
- One Got Away
H3: ODST: View the missing link.
Locked - 6 guides
- Like a Broken Record
H3: ODST: Find a legendary hidden music cue.
Locked - 4 guides
- Vandalised
H3: ODST: Face it.
Locked - 6 guides
- Saturday Morning Cartoon
H3: ODST: Is there a toy inside?
Locked - 7 guides
- Classic
H3: ODST: Finish any level solo on Legendary, with no shots fired or grenades thrown.
Locked - 7 guides
- Catch 'Em Napping
H3: ODST: Kill 5 sleeping Grunts on Mombasa Streets.
- Strong, Silent Type
H3: ODST: Assassinate 3 Brutes in a row on Data Hive.
Locked - 5 guides
- Fowl Hunt
H3: ODST: Kill 3 Jetpack Brutes with a shotgun on Oni Alpha Site.
Locked - 4 guides
- Does Whatever a Spartan Can?
H3: ODST: Destroy a Wraith…with your bare hands.
Locked - 2 guides
- Firefly
H3: ODST: Kill a Drone with a flame grenade on Data Hive.
Locked - 3 guides
- "BLAM" Said The Lady!
H3: ODST: Swap Dare's pistol for a Rocket Launcher on Coastal Highway.
Locked - 5 guides
- One-Way Ride
H3: ODST: Complete any level without using a health pack on Heroic or Legendary.
Locked - 2 guides
- Just Sayin...I Ain't Dead
H3: ODST: Complete any level without dying on Heroic or Legendary.
Locked - 3 guides
- Those Left Behind
H3: ODST: Finish Tayari Plaza with at least one Marine still breathing.
Locked - 6 guides
- Shoot and Scoot
H3: ODST: Complete NMPD HQ without firing the Sniper Rifle on Heroic or Legendary.
Locked - 2 guides
- Fast and Low
H3: ODST: Splatter 7 enemies with a Banshee on Kikowani Station.
Locked - 4 guides
- Shiny...
H3: ODST: Pilot a Banshee on Kizingo Boulevard.
Locked - 7 guides
- Bits and Pieces
H3: ODST: Destroy 5 Phantoms on NMPD HQ.
Locked - 4 guides
- What About Those Tanks?
H3: ODST: Destroy 7 Wraiths on Oni Alpha Site.
Locked - 5 guides
- Xenophobia
H3: ODST: Complete any level without using Covenant weapons.
Locked - 4 guides