The Vidmasters were a pain for me, so I figured a guide would help everyone else

Vidmaster : Classic
This is the easiest vidmaster, in my opinion, so we'll start with this one.
The achievement says that you must complete a level on Legendary without ever firing a bullet or throwing a grenade.
Its easier than it seems, because all you need to do is follow this video...

The video basically says to do the mission Uplift Reserve, and use the Warthog/Ghost the whole time.
IMPORTANT NOTE: Don't honk the horn on the Warthog, it counts as firing a bullet!

Vidmaster : Deja Vu
Now we step into the achievement that is oh so familiar to people who have gotten Vidmaster Annual
This achievement says that you must complete Coastal Highway on 4-player co-op with the IRON skull activated and with no 'Hog or Tank
Again, not as hard as it seems.
A few pointers - Communicate!!! Don't just randomly go ahead and keep dying. Pay attention to your teammates and what they are doing
- Use the mongooses and "infinite ammo rocket launchers"
They are located at the first underpass, just look at the video and you'll see what I'm talking about
-Have patience! Don't just give up after 3-4 deaths and don't get dicouraged
Video guide...


Vidmaster : Endure
Vidmaster Endure, that elusive achievement that everyone says is nearly impossible.
...and yes, it really is THAT hard
But don't fear, that's what this guide is for
The achievement says that you must make it past the 4th set on 4-player Heroic Firefight
- Recommended location : Alpha Site, its very "easy" if you know the right strategy
-The strategy is that you basically stand near the two staircases near your spawn and let the enemies rush you
-NEVER rush the enemy, its pointless and will cost you lives
-Refer to video, its really the best guide

Hope this guide helps you guys trying to get Recon armor in Halo 3
Good Luck!

EDIT: Sorry, but I forgot to give credit for the idea of this guide to Mr Greenbird. Thanks!
Good Luck!