List of Halo 3 and Halo 3: ODST medals

Medals currently awarded in the Halo 3 Beta

General

• Death from the Grave! - Kill an opponent after you have died.
• Laser Kill! - Get an opponent with the Spartan Laser.
• Grenade Stick! - Kill an opponent by sticking them with a Plasma Grenade or Spike Grenade.
• Killjoy! - End an opponent's killing spree, any spree.
• Assassin! - Hit and kill an opponent with a melee attack from behind.
• Beat Down! - Hit and kill an opponent with a melee attack.
• Extermination! - Get an overkill on the opposing team that results in all the team being dead.

Spree medals

• Killing Spree! - 5 kills in a row without dying
• Killing Frenzy! - 10 kills in a row without dying
• Running Riot! - 15 kills in a row without dying
• Rampage! - 20 kills in a row without dying
• Untouchable! - 25 kills in a row without dying
• Invincible! - 30 kills in a row without dying

Multi-kill medals

• Double Kill! - Kill 2 opponents within 4 seconds of the previous kill.
• Triple Kill! - Kill 3 opponents within 4 seconds of the previous kill.
• Overkill! - Kill 4 opponents within 4 seconds of the previous kill.
• Killtacular! - Kill 5 opponents within 4 seconds of the previous kill.
• Killtrocity! - Kill 6 opponents within 4 seconds of the previous kill.
• Killimanjaro! - Kill 7 opponents within 4 seconds of the previous kill.

Sniper Medals

• Sniper Kill! - Kill opponent with a sniper weapon.
• Sniper Spree! - Kill 5 opponents in a row with the sniper without dying.
• Sharpshooter - Kill 10 opponents in a row with the sniper without dying.

Shotgun Medals

• Shotgun Spree! - Kill 5 opponents in a row with the Shotgun without dying.
• Cheneymania!- Kill 10 opponents in a row with the Shotgun without dying.

Vehicle Medals

• Splatter! - Hit and kill an opponent with a vehicle.
• Splatter Spree - Splatter 5 opponents in a row with a vehicle without dying.
• Vehicular Manslaughter! - Splatter 10 opponents in a row with a vehicle without dying.
• Wheelman! - Be the driver of a vehicle when a passenger kills an opponent.
• Highjacker! - Board a vehicle.

Objective Medals

VIP

• Killed VIP! - Kill an opponent's VIP in a VIP game.

Assault

• Bomb Planted! - Plant the bomb in Assault.
• Killed Bomb Carrier! - Kill an opponent bomb carrier in Assault.

CTF

• Flag Score! - Score the flag in CTF.
• Killed Flag Carrier! - Kill the opponent flag carrier in CTF.
• Flag Kill! - Get a melee kill with the flag.

King of the Hill

• Hail to the King! - Kill 5 opponents in a row from inside the hill without dying before it moves.

Oddball

• Oddball Kill! - Get a melee kill when holding the oddball.

Slayer

• Perfection! - Win a slayer game with 15 kills or more without dying.

References

http://www.the360forum.com/showthread.php?t=14802 http://sorahn.net/pics/h3/medals/