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.