Hidden skulls have been with the series since Halo 2, so naturally ODST brings with it a unique set of hidden skulls to find. There are three total, each hidden inside one of the new multiplayer maps. Fortunately, you don't need to search for the skulls while in the midst of a multiplayer battle—in fact, you'll need to find them in Forge mode (Forge is available on the multiplayer disc). Load up the level and use the flying camera mode to navigate to the skull locations, which we've outlined in the video below. When you've found the skull, position yourself above it and then toggle out of the flying camera mode and hold whichever button you've got mapped to 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, just try again
The following missions can be unlocked for Firefight.
- Alpha Site - Complete Mission 05 on Normal, Heroic or Legendary
- Chasm Ten - Complete Mission 08 on Normal, Heroic or Legendary
- Last Exit - Complete Mission 09 on Normal, Heroic or Legendary
- Lost Platoon - Complete Mission 03 on Normal, Heroic or Legendary
The following armor can be unlocked for use in Firefight:Dare's Recon Armor - Finish the Campaign on Legendary
The following characters can be unlocked for use in Firefight. Most are unlocked by playing the Campaign.
- Buck - Complete Mission 02 on Normal, Heroic or Legendary
- Dutch - Complete Mission 03 on Normal, Heroic or Legendary
- Mickey - Complete Mission 04 on Normal, Heroic or Legendary
- Romeo - Complete Mission 06 on Normal, Heroic or Legendary
- Dare - Complete the Campaign on Legendary
Road to Recon!
Recon Armor in Halo 3 multiplayer is an exclusive handout available only to a select few, but with ODST it's become a badge of honor that dedicated Halo fanatics can unlock for themselves. There are seven Achievements that must be earned—three in ODST, and four in the original Halo 3 before you can head over to Bungie.net to get a download code. These are those seven Achievements.
- Vidmaster Challenge: Annual - Complete Halo on 4-player Legendary LIVE co-op, with Iron, and everyone in Ghosts.
- Vidmaster Challenge: Lightswitch - Get the rank of Lieutenant in any playlist in the new EXP progression system.
- Vidmaster Challenge: 7 on 7 - Entered into a ranked or social playlist with 7 EXP on the 7th of the month.
- Vidmaster Challenge: Brainpan - Find all the hidden skulls on the Mythic maps.
- Vidmaster Challenge: Classic - Finish any level solo on Legendary, on LIVE, with no shots fired or grenades thrown.
- Vidmaster Challenge: Endure - In Firefight, on any mission, pass the 4th Set on 4-player Heroic LIVE co-op.
- Vidmaster Challenge: Deja Vu - Complete Highway on 4-player Legendary LIVE co-op with Iron, and no 'Hog or Scorpion
Halo 3 Achievements
Halo 3: ODST Achievements