
Halo 4: Complete a Halo 4 playlist.
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.

Halo 4: Complete a Halo 4 playlist.
Very rare
Halo 4: Complete all chapters in Spartan Ops Episode 4.
Very rare
Halo 2: Collect the Cortana toy in Gravemind.
Very rare
Halo 2: Collect the Rampant Cortana toy in High Charity.
Very rare
Halo 4: Beat the par time on Infinity.
Very rare
Win 450 multiplayer games.
Very rare
H3: ODST: Find all 30 Audio Logs.
Very rare
Halo 2: Complete a Halo 2 playlist.
Very rare
Halo 2: Find and claim the That's Just...Wrong Skull on Legendary.
Very rare
Halo 2: Find and claim the Thunderstorm Skull on Legendary.
Very rare
Halo 2: Beat the par score on Uprising.
Very rare
Halo: Reach: Find your way into Halsey's Lab on The Package.
Very rare
Halo 2: Beat the par time on The Great Journey.
Very rare
H3: ODST: Find the 30th Audio Log.
Very rare
Halo 3: Beat the par score on every Halo 3 level.
Very rare
Halo 2: Complete Metropolis without entering a vehicle on Heroic or Legendary.
Very rare
Earn a total of 250 Beat Down medals in multiplayer.
Very rare
Halo 2: View both signs in the level Metropolis.
Very rare
Halo CE: Complete a level without jumping.
Very rare
H3: ODST: Beat the par time on NMPD HQ.
Very rare