I made this thread so that people don' really have to make extra threads. I will also be happy to help with anyone if they need help with certain achievements. Also, I will be adding in the post some things on how to unlock certain thins on ODST.
Also I will post on how to get the achievement if people don't know how to get them.
- Easy ODST Vidmaster Challenge: Classic Achievement
On Uplift Reserve, at the first Warthog Area, enter a Hog and give a soldier in the passenger seat your Spartan Laser. Make sure you have a gunner as well and, with some clever driving, you can get though the level without firing a shot! You may die as many times as you want.
- Vidmaster Challenge: Deja Vu:
"Complete Coastal Highway on 4-player Legendary LIVE co-op, with the Iron skull on and without using Warthogs or Scorpion Tanks."
- Vidmaster Challenge: Endure:
"In Firefight, on any mission, pass the 4th set on 4-player Heroic LIVE co-op."
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
UNSC Sergeant Avery Johnson - Unique pre-order codes were given out for this character
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
Halo 3: ODST Recon Armor
Road to Recon!
NOTE: 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.
Halo 3 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.
Halo 3: ODST Achievements
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.
Information from IGN!
If you need help, just post your gamertag and tell what you need help with. Also make sure that you tell the person when you want to do the achievement.