Halo 3 Medals

link title 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 sticky or brute 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 he 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 5 opponents within 4 seconds of the previous kill.
 * Killimanjaro! - Kill 6 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 5 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.

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.