From Halopedia, the Halo wiki
Unfrigginbelievable • Killionaire • Perfection • Extermination • Skullamanjaro • Hero
Killing Spree • Killing Frenzy • Running Riot • Rampage • Untouchable • Invincible • Inconceivable • Hammer Spree • Dream Crusher • Wrecking Crew • Shotgun Spree • Open Season • Buck Wild • Sniper Spree • Sharpshooter • Be the Bullet • Stick Spree • Sticky Fingers • Corrected • Sword Spree • Slice 'N Dice • Cutting Crew • Splatter Spree • Vehicular Manslaughter • Sunday Driver • Wheelman Spree • Road Hog • Road Rage • Laser Spree • Red Menace • Sunburst • Assist Spree • Sidekick • Second Gunman • Juggernaut Spree • Immovable Object • Unstoppable Force • Infection Spree • Mmmm... Brains • Thriller • Zombie Killing Spree • Hell's Janitor • Hell's Jerome • Spawn Spree • Wingman • Broseidon
Assassin • Assist • Avenger • Beat Down • Bulltrue • Hijacker • Close Call • EMP Blast • Firebird • First Strike • Flag Kill • Grenade Stick • Headcase • Headshot • Kill from the Grave • Killjoy • Laser Kill • Needle Combine Kill • Oddball Kill • Protector • Pull • Pummel • Rejection • Reload This! • Revenge • Showstopper • Skyjack • Sniper Kill • Splatter • Wheelman • Yoink • Opportunist (Beta only)
Hail to the King • Bomb Planted • Flag Score • Killed Oddball Carrier • Killed Bomb Carrier • Killed Flag Carrier • Killed Juggernaut • Last Man Standing
Avenge Me • Big Game Hunter • Ennobled • H. Ryan Memorial • Seek and Destroy • Thank the Maker • Funkadelic • Party Animal • Love Machine • Triple Double • Bros to the End • Steaktacular • Linktacular • Wildcat Destabilizer