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.

It is represented by a green Marathon symbol, with the Iron Skull in front of it and four white stars surrounding the Iron Skull.

Strategies and Tips

 * At the beginning of the Highway, there is a tunnel that leads underground. You will find four Rocket Launchers, with 998 rockets, and two 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 998 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 Oliphant.
 * 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.
 * Do not tell Buck to exit the gunner seat of the warthog, as it will prevent you from getting the achievement.
 * A charged Plasma pistol will help you hijack Ghosts if you're close enough.

Trivia

 * The achievement is named due to its similarity to the previous Vidmaster Challenge achievement Annual, which also requires the Iron Skull,4 player Legendary live co-op play, and finishing in a light vehicle(As walking is not suggested due to the Oliphant being quite speedy and on legendary can be destroyed in a matter of seconds from enemies).