Assembled the Majority
Halo: Reach: Find Data Pad 18 on The Pillar Of Autumn on Legendary difficulty
Very rare1.50%last reported global rate
Steam
Halo: The Master Chief Collection Achievements
Official Steam achievement definitions and latest reported global unlock rates, ordered from rarest to most common.
Total achievements700
Rarest rate0.500%
Ultra rare56
Last checkedSep 28, 2026
Delayed official data
Rates and award counts were last observed on Sep 28, 2026.
Because It Wasn't Hard Enough
Halo: Reach: Complete a Legendary campaign mission with 3 or more skulls enabled (Scoring Only).
Very rare1.50%last reported global rate
Chief, Smash!
Halo 4: Kill 3 Crawlers in one hit with the Gravity Hammer on Midnight.
Very rare1.50%last reported global rate
Classic Completion
Halo: Reach: Complete Exodus without using any armor abilities.
Very rare1.50%last reported global rate
Curious Composition
Halo: Reach: Find Data Pad 16 on New Alexandria on Legendary difficulty
Very rare1.50%last reported global rate
Haplorrhini
Halo 3: Find a lonely missing link.
Very rare1.50%last reported global rate
How Pedestrian
Halo CE: Complete Halo without entering a vehicle.
Very rare1.50%last reported global rate
Just Like Storming a Castle
Halo: Reach: Beat the par time on ONI: Sword Base.
Very rare1.50%last reported global rate
Memento Mori
Halo 4: Complete all chapters in Spartan Ops Episode 5.
Very rare1.50%last reported global rate
Multiplayer Champion
Win 500 multiplayer games.
Very rare1.50%last reported global rate
No Pain, No Gain
Complete 1 mission with the LASO playlist skulls enabled.
Very rare1.50%last reported global rate
Of Patience and Partiality
Halo: Reach: Find Data Pad 15 on Exodus on Legendary difficulty
Very rare1.50%last reported global rate
Regrettable Turn of Events
Halo 2: Collect the Prophet of Regret toy in Regret.
Very rare1.50%last reported global rate
Scarab Lord
Halo 2: Acquire the Scarab Gun.
Very rare1.50%last reported global rate
Silent Shepherds
Halo: Reach: Find Data Pad 17 on The Package on Legendary difficulty
Very rare1.50%last reported global rate
Skulltaker Halo 2: Catch
Halo 2: Find and claim the Catch Skull on Legendary.
Very rare1.50%last reported global rate
Skulltaker Halo 2: Envy
Halo 2: Find and claim the Envy Skull on Legendary.
Very rare1.50%last reported global rate
Terminal Velocity
Halo 2: Beat the par time on Sacred Icon.
Very rare1.50%last reported global rate
Terminus
Halo 4: Activate all Halo 4 Terminals.
Very rare1.50%last reported global rate
And So It Begins...
Halo 2: Collect the Master Chief toy in Delta Halo.
Very rare1.60%last reported global rate