Go Left, Trooper!
Now lets switch gears and look at the Halo 3: ODST vidmasters. In the same vein as annual, there's Déjà Vu. Once again, play the final mission (Highway) with three friends, turn on Iron, Legendary difficulty, and do NOT enter a warthog or scorpion. Don't worry, you won't miss them too much. When you get to the highway, head down the first ramp that takes you below the highway. There, you'll find four rocket launchers and two mongooses (mongeese? still haven't figured that out). The rest of the level is just a matter of making sure you hit checkpoints as a group and a few pretty simple strategies. The method that seems to work the best is rushing to the next door at each section, turn around and play defense until Dare and Virgil catch up. Whenever there are ramps that lead below the highway, go down there, dismount, and use their cover to help take out banshees and ghosts. One of the most important tips I can offer is always go through the blast doors as a group after you kill all enemies. If you don't, you may miss checkpoints which could lead to huge setbacks whenever someone dies. This achievement is easily obtainable by any good team who sticks together, but a little extra research will make it a pleasurable experience. Check out this guide, again, provided by SIP, to see the above tips and more in action. SIP also has a Highwayman Team (private forum, join SIP for access) who will help you get this achievement in no time.
The only Vidmaster achievement that doesn't contain any sort of co-op, is Classic. It's almost ironic that the one completely solo achievement is actually one of the easiest to achieve. To get Classic, you must complete any mission, solo, on Legendary, and not fire a single shot or throwing any grenades. Note, it has been reported that pulling the right trigger while in a vehicle will actually void the achievement as well. You've been warned. This achievement sounds a lot harder than it actually is. The mission of choice is Uplift Reserve, so fire it up in Legendary. You start off with a path ahead of you. Head down that path until it opens up to a clearing. You'll be greeted by frantic marines and told to help them recover a warthog. Ignore them, you won't pull it off without firing your weapon. Instead, make a hard left and avoid covenant troops the best you can. Eventually you may catch the attention of a brute driving a chopper.
Fail.
There's an easy way to get him off that chopper. Stand with your back against the wall of rocks. He'll foolishly charge at you and run into the rocks (of course you'll have to dodge him). He should slow to a dead stop and possibly even flip himself off the chopper. Either way, this is your chance to steal it! Once you're aboard the chopper, continue along the rock wall, boost your way around the wraith, and head down the path that wraith came from. A little ways down the path you'll find a ghost. Time to switch vehicles and continue on. If you don't know this mission very well, you'll want to take a minute to study the map whenever you're away from the action. The rest of the mission is a cinch! Just boost as much as you can with the ghost, and try your best to avoid confrontations with wraiths. I've shared a video of my Classic run on Bungie.net, but I don't think you'll need it. This one took me just 15 minutes (although I wasted six minutes before I decided to go left to avoid everything).