Vidmaster Challenge: Annual

Vidmaster Challenge: Annual is an Halo 3 XBL-exclusive achievement where you have to complete the level Halo on four-player Legendary Co-Op with the Iron Skull activated, and everyone in Ghosts.

Achievement Tips

 * The only way to get Ghosts in the mission is to play on Legendary Co-op from Mission Start until the end. They will not show up if the level is started from Rally Point Alpha or if played on a Solo Campaign. There are four Ghosts directly under the ramp to the left as you exit the control room.
 * The Ghosts also have a major disadvantage against the Warthog: the ability of auto-aim. This problem means that some passageways guarded by carrier forms become almost impossible to access, attempting to speed past carrier forms is now impossible, because if your cross-hairs point at them you will lock on to them and drift towards them, resulting in damage to your ghost and, in fact, you may fall to your death. A good way to counteract this is to look up while you drive. However, you have a limited range of sight while you are doing this, so it is not recommended while tiles fall under you.
 * A secret way has been discovered to complete the challenge much faster. It is possible to skip climbing up the tower by climbing up the slant on the way up, jumping across and landing one floor up.
 * Make sure that everyone doing the achievement is sure that they won't lag out of the game midway because there's nothing more annoying than having to restart the level after someone's connection messed up when you were almost at the end.
 * Even though all players must ride a Ghost, only one of the players are required to reach the end on a Ghost for all four players to receive the achievement. This does not mean the other three aren't required to ride Ghosts. If the players reach a replacement vehicle during the ending run, they may use it only if his/her Ghost is destroyed.
 * The flooring sections near the end will fall out from under the last player if your ghost group is not tightly packed enough. Use the interior hall sections to tighten up your formation before exiting - the timing of the floor tiles is based on when you enter the open sections, not total time in the mission.
 * Skipping the end cutscene may result in reverting to the previous checkpoint. It's highly advised to watch the entire ending cutscene.

Walkthrough

 * Start the level by going to the left side of the tower. There is a small raised snow bank. Have one player stand there and a second jump on his head. Then the bottom player jumps and in mid air the top one jumps and the bottom jumps again and when they touch the top player must jump again to reach the ledge. The other 3 players stay at the bottom of the tower The player on the ledge must then take a right and Grenade Jump to the diagonal ledge that leads up the tower. Walk to the top all the way and look to the left to see a diagonal beam faceted to the wall leading upwards toward the snow where Avery Johnson is; jump on it then walk and jump to him and wait as he kills all the Flood. Jump down and when you walk through the door all the other players will be teleported there. Kill 343 Guilty Spark as normal and then head out back to where you were and take a left and down the ramp you will find the Ghosts. Carefully go up the tower and head toward where you find the Warthogs and complete the track as you usually would being sure to keep a tight group and make sure to slow down for those who fall behind.  For a fileshare video of what to do, check here. For a Youtube walkthrough by the same person, click here.

Facts
"Let’s dive into this a little deeper and try and address some of the questions that will no doubt arise from the community. First off are the “Vidmaster Challenge” achievements. These three will not earn you any gamer points but there will (eventually) be a pay-off. We’re not going to spoil the fun just yet but suffice it to say that gamerscore isn’t everything. There is a pot of gold at the end of the Vidmaster rainbow and it is something you will want. It unlocks Recon armor."

- SketchFactor


 * The Vidmaster achievements do not reward the player with points but if all the Vidmaster achievements are acquired then the player will be rewarded with Recon armor for online play. Though, the player must also own a copy of Halo 3: ODST in order to finish the Vidmaster achievements.


 * There were some cases of people getting this achievement on the 24th of September, because of time zone differences.


 * There are seven Vidmaster achievements; four achievements can be found in Halo 3 while the other three are, as of now, to be released with Halo 3: ODST.


 * Following the completion of this level the normal cutscene will be different. Instead of just a warthog, a warthog and a ghost will jump in the Frigate.


 * If you look at the background, there will be the Marathon symbol, which was another game made by Bungie.