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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.

141

Animal Habitat

Halo 2: Spot the hippo on the walls of Headlong in classic multiplayer.

Very rare

1.40%last reported global rate

142

Assembly Skull

Halo 3: Find the hidden Skull on the Assembly multiplayer map.

Very rare

1.40%last reported global rate

143

Back In The Day

Halo CE: Play a CTF custom game on Blood Gulch with 4 players. Tri-tip optional.

Very rare

1.40%last reported global rate

144

Countdown

Halo 4: Beat the par time on Midnight.

Very rare

1.40%last reported global rate

145

Floor It!

H3: ODST: Beat the par time on Uplift Reserve.

Very rare

1.40%last reported global rate

146

He's Running a Marathon...

Halo 2: Spot the developer in the opening cutscene of Gravemind on Legendary in Classic Mode.

Very rare

1.40%last reported global rate

147

Longshore Skull

Halo 3: Find the hidden Skull on the Longshore multilayer map.

Very rare

1.40%last reported global rate

148

Madrigal Debut

Halo CE: Trigger a hidden music cue in Halo: CE.

Very rare

1.40%last reported global rate

149

Missing Link

Halo 3: Watching. Waiting. Plotting.

Very rare

1.40%last reported global rate

150

Orbital Skull

Halo 3: Find the hidden Skull on the Orbital multiplayer map.

Very rare

1.40%last reported global rate

151

Sandbox Skull

Halo 3: Find the hidden Skull on the Sandbox multiplayer map.

Very rare

1.40%last reported global rate

152

Scattered

Halo 4: Complete all chapters in Spartan Ops Episode 6.

Very rare

1.40%last reported global rate

153

Skulltaker Halo 2: Assassins

Halo 2: Find and claim the Assassins Skull on Legendary.

Very rare

1.40%last reported global rate

154

Skulltaker Halo 2: Sputnik

Halo 2: Find and claim the Sputnik Skull on Legendary.

Very rare

1.40%last reported global rate

155

Stayin' Alive

Halo 2A MP: In Juggernaut, survive as the Juggernaut for 30 seconds.

Very rare

1.40%last reported global rate

156

The Will of the Prophets

Halo 2: Collect the Arbiter toy in Sacred Icon.

Very rare

1.40%last reported global rate

157

Waypoint

Halo 3: Beat the par time on The Ark.

Very rare

1.40%last reported global rate

158

We'll Be Back

Halo: Reach: Beat the par score on every Halo: Reach level.

Very rare

1.40%last reported global rate

159

Would It've Killed You To Take The Elevator

Halo CE: Beat the par time on Assault on the Control Room.

Very rare

1.40%last reported global rate

160

An Artist's Canvas

H3: ODST: Beat the par time on Kizingo Blvd.

Very rare

1.50%last reported global rate