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 1000 rockets (2 loaded in the Rocket and 998 on reserve), 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 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 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).