
Halo 3: Complete every level of the game on Heroic 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 3: Complete every level of the game on Heroic difficulty.
Rare
Halo 2: Beat the par time on High Charity.
Rare
Halo: Reach: Beat the par score on Long Night of Solace.
Rare
Halo 3: Beat the par score on The Covenant.
Rare
Halo 2: Beat the par time on Cairo Station.
Rare
Halo 2: Activate Terminal 7 on Regret.
Rare
Complete 250 missions or multiplayer games.
Rare
Halo 2A MP: In Anniversary multiplayer, receive 2 or more Double Kill medals.
Rare
H3: ODST: Beat the par score on Data Hive.
Rare
Win 50 multiplayer games.
Rare
H3: ODST: Kill 4 enemies with a single plasma or frag grenade.
Rare
Halo: Reach: Beat the par time on Long Night of Solace.
Rare
Halo 3: Beat the par score on The Ark.
Rare
H3: ODST: Beat the par score on Kizingo Blvd.
Rare
Halo 4: Access the Master Chief's records on Dawn.
Rare
Halo 2: Beat the par score on The Great Journey.
Rare
Halo CE: Complete every level of the game on Heroic difficulty.
Rare
Halo: Reach: Find Data Pad on 1 Winter Contingency
Rare
Collect 8,000 campaign or playlist medals.
Rare
H3: ODST: Find the 7th Audio Log.
Rare