
Halo CE: Complete every level of the game on Legendary difficulty.
Rare
Official Steam achievement definitions and latest reported global unlock rates, ordered from rarest to most common.
Rates and award counts were last observed on Sep 28, 2026.

Halo CE: Complete every level of the game on Legendary difficulty.
Rare
Halo 4: Activate Terminal 1 on Requiem.
Rare
Halo 2A MP: Kill an opponent by detonating a Fusion Coil.
Rare
Halo 4: Complete a match on at least 4 different game types in multiplayer.
Rare
Halo 4: Beat the par score on Midnight.
Rare
H3: ODST: Destroy 5 Phantoms on NMPD HQ.
Rare
H3: ODST: Play a game of Halo 3: ODST on the 22nd of any month.
Rare
H3: ODST: Destroy a Wraith…with your bare hands.
Rare
Earn a total of 250 Double Kill medals in matchmade games.
Rare
Complete 450 missions or multiplayer games.
Rare
Halo: Reach: Finish The Package on Legendary with the Scorpion intact.
Rare
Kill 100 Watchers.
Rare
Halo 2: Beat the par score on Regret.
Rare
H3: ODST: Find the 11th Audio Log.
Rare
Halo 4: Beat the par score on Reclaimer.
Rare
Halo 3: Find and claim the Grunt Birthday Party Skull on Normal or harder.
Rare
Halo 4: Complete every level of the game on Heroic difficulty.
Rare
Halo 2A MP: Finished as the top player on the winning team in a matchmade game.
Rare
Halo CE: Find and claim the Iron skull in remastered mode.
Rare
H3: ODST: Beat the par score on Uplift Reserve.
Rare