Vidmaster Challenge: Déjà Vu

Vidmaster Challenge: Déjà Vu is an achievement in Halo 3: ODST and one of the Vidmaster Challenges. It is unlocked when you complete Coastal Highway on 4-player Legendary Live co-op, with Iron skull activated, and not using the Warthog or Scorpion at all. It is worth 25 Gamerpoints.

Strategies and Tips

 * At the beginning of the Highway there is a tunnel that leads underground there you will find 4 Rocket Launchers with 998 ammo and 2 Mongooses. These only appear by putting the Iron Skull on Legendary.
 * The Rocket Launchers mentioned above have special properties, allowing you to carry a rocket launcher from the first part of the level and the 1000 rocket version, implying that these were specially made to make this very difficult level easier.
 * If there are Banshees, try to get off your Mongoose and destroy them when they move to you.
 * Try to stay behind the Elephant.
 * Don't rush the level; try to stay back and destroy the Ghosts and Banshees before moving in
 * If nothing else works try walking in a group. It may sound crazy but almost nothing can stop a squad of four ODSTs with seemingly infinite rocket launcher ammo.

Warnings

 * Do not tell Buck to exit the gunner seat of the warthog as it will prevent you from getting the achievement.

Trivia

 * The achievement is named due to its similarity to the previous Vidmaster Challenge achievement Annual, which also requires the Iron Skull and 4 player Legendary live co-op play.