
H3: ODST: Complete NMPD HQ without firing the Sniper Rifle on Heroic or Legendary.
Very 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.

H3: ODST: Complete NMPD HQ without firing the Sniper Rifle on Heroic or Legendary.
Very rare
Halo 3: Beat the par time on all Halo 3 levels.
Very rare
Halo 2A MP: Get a kill with the Gungoose while airborne.
Very rare
Halo: Reach: Complete three Halo: Reach playlists.
Very rare
Halo 3: On The Ark, complete the level without entering a vehicle on Legendary.
Very rare
Halo 2A MP: In Assault, take, plant, and score from the bomb spawn without dying or dropping it.
Very rare
Earn a total of 100 Legendary medals in matchmade games.
Very rare
Halo 4: Complete all chapters in Spartan Ops Episode 10.
Very rare
Halo 4: Complete all chapters in Spartan Ops Episode 8.
Very rare
H3: ODST: Splatter 7 enemies with a Banshee on Kikowani Station.
Very rare
Halo: Reach: Beat par time on all Halo: Reach levels.
Very rare
H3: ODST: Beat the par time on Kikowani Station.
Very rare
Halo 2: Oh, hi!
Very rare
Halo 3: Who DARED to discard this brave animal?
Very rare
Halo 4: Beat the par time on Requiem.
Very rare
Halo 4: Complete all chapters in Spartan Ops Episode 9.
Very rare
Complete three cross-game playlists.
Very rare
Halo 2A MP: On Zenith, personally activate the center energy shield 3 times in one matchmade game.
Very rare
Halo 2: Spot the Sid graffiti on the walls of Coagulation in classic multiplayer.
Very rare
Halo 2: Find and claim the Ghost Skull on Legendary.
Very rare