Alas, Poor Yorick (25) - On a Legendary map, get 3 Oddball melee kills during any ranked or social match.
Assembly Skull (25) - On Assembly, find the hidden skull.
Awww Too Bad (25) - On a Mythic map, get a Killjoy medal during any ranked or social match.
Blades of Fury (25) - On Heretic, get a Sword Spree during any ranked or social match.
Came... From... Behind (50) - On a Legendary map, get 3 assassinations during any ranked or social match.
Citadel Skull (25) - On Citadel, find the hidden skull.
Defend This (25) - On a Legendary map, get a flag melee kill during any ranked or social match.
Delicious Brains (25) - On a Mythic map, infect 2 humans during any ranked or social match.
Double Double (25) - On a Legendary map, get two Double Kills during any ranked or social match.
Flag Dropped (25) - On a Legendary map, get 2 flag carrier kills during any ranked or social match.
Ghost Patrol (25) - On Longshore, get 3 kills with a Ghost during any ranked or social match.
Hammer Time (25) - On Assembly, get 5 Hammer kills during any ranked or social match.
Have Fun Respawning (25) - On a Mythic map, get an Extermination during any ranked or social match.
Heretic Skull (25) - On Heretic, find the hidden skull.
Killtacular (25) - On a Mythic map, get a Killtacular during any ranked or social match.
Logshore Skull (25) - On Longshore, find the hidden skull.
Look Both Ways (50) - On a Legendary map, get a Splatter Spree during any ranked or social match.
Orbital Skull (25) - On Orbital, find the hidden skull.
Post Mortem (25) - On Orbital, get 2 Death From the Grave medals during any ranked or social match.
Pull (25) - On Citadel, get a Shotgun Spree during any ranked or social match.
Road Rage (25) - On a Legendary map, get 5 Warthog chaingun kills during any ranked or social match.
Sandbox Skull (25) - On Sandbox, find the hidden skull.
Save This Film (25) - On a Mythic map, get a Perfection medal during any ranked or social match.
Tank Dropper (25) - On any Mythic map, get a kill on another player while in monitor mode.
Vidmaster Challenge: 7 on 7 (0) - Enter into any ranked or social playlist with 7 EXP on the 7th of the month.
Vidmaster Challenge: Annual (0) - After 9/25/08, complete Halo on 4-player Legendary LIVE co-op, with Iron, and everyone in Ghosts.
Vidmaster Challenge: Brainpan (25) - Find all the hidden skulls on the Mythic maps.
Vidmaster Challenge: Lightswitch (0) - Get to the rank of Lieutenant in any playlist in the new EXP progression system.
Zombie Repeller (25) - On a Mythic map, kill 2 Zombies during any ranked or social match.
...Get the Horns (25) - On a Mythic map, get a Bulltrue medal during any ranked or social match.

Submitted By: MacAttack1011, twincash

Sniper Guide

Tired of being on the wrong end of a headshot? We'll show you where to stand with our Sniper's Guide to Halo 3.

Submitted By: GamesRadar

Halo 3 Skulls Guide (With Video!)

Find all of the skulls in Halo 3 (gold and silver)!

Download Multiplayer Maps!

Master the multiplayer by downloading and studying our detailed maps!

Or, check out all of our ongoing Halo 3 coverage.

Halo 3 Heat Maps

Halo 3 heat maps show where every kill and death occur level by level for your strategic analysis.

Submitted By: Robots

Terminal Video Guide

Use our Terminal Video Guide to find ever terminal and uncover Halo 3's secret story.

Submitted By: GamesRadar

How Bungie Plays

Who better to learn from than the creators themselves? Master the Legendary Maps with our video guide and interviews with Bungie that'll teach you how to play like a pro.

Submitted By: GamesRadar