Back to Halo: The Master Chief Collection

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.

181

Dirge of Madrigal

Halo 3: Trigger the hidden music cue in Halo 3.

Very rare

1.60%last reported global rate

182

Eminent Domain

Halo 2A MP: In Territories, control any 3 Territories simultaneously for 30 seconds.

Very rare

1.60%last reported global rate

183

Flyover Country

Halo CE: Beat the par time on Halo.

Very rare

1.60%last reported global rate

184

Fowl Hunt

H3: ODST: Kill 3 Jetpack Brutes with a shotgun on Oni Alpha Site.

Very rare

1.60%last reported global rate

185

GOOOAAAAALLLL!

Halo 2: Shoot the soccer ball in the level Metropolis.

Very rare

1.60%last reported global rate

186

Headhunter

Halo CE: Find and claim all Skulls in Halo: CE.

Very rare

1.60%last reported global rate

187

Mystery Achievement

Inscrutable. Mysterious.

Very rare

1.60%last reported global rate

188

No Stone Unturned

Halo 3: Activate all Halo 3 Terminals.

Very rare

1.60%last reported global rate

189

Paper Trail

Halo: Reach: Find Data Pad 7 on New Alexandria

Very rare

1.60%last reported global rate

190

Party Pooper

Earn a total of 250 Killjoy medals in matchmade games.

Very rare

1.60%last reported global rate

191

Skulltaker Halo 2: Famine

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

Very rare

1.60%last reported global rate

192

Skulltaker Halo 2: Grunt Birthday Party

Halo 2: Find and claim the Grunt Birthday Party Skull on Legendary.

Very rare

1.60%last reported global rate

193

Symphony of Pain

Halo 4: Beat the par time on Composer.

Very rare

1.60%last reported global rate

194

The Answer is Simple

Halo: Reach: Find Data Pad 14 on Long Night Of Solace on Legendary Difficulty

Very rare

1.60%last reported global rate

195

This Oliphant Has No Brakes

H3: ODST: Beat the par score on Coastal Highway.

Very rare

1.60%last reported global rate

196

Walking Encyclopedia

Halo 2: Activate all Halo 2 Terminals.

Very rare

1.60%last reported global rate

197

We're Gonna Need a Bigger Ship

Halo: Reach: Fly both the Pelican and Phantom on New Alexandria.

Very rare

1.60%last reported global rate

198

Workers' Compensation

Halo: Reach: Splatter an enemy using the forklift.

Very rare

1.60%last reported global rate

199

Yes No You Decide

Halo: Reach: Find Data Pad 19 on Lone Wolf on Legendary difficulty

Very rare

1.60%last reported global rate

200

Begins with a Single Step

Halo 3: On Tsavo Highway, complete the level without entering a vehicle.

Very rare

1.70%last reported global rate