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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.

321

Cryptum

Halo 4: Activate Terminal 7 on Midnight.

Very rare

2.90%last reported global rate

322

Plugged In

H3: ODST: Find the 17th Audio Log.

Very rare

2.90%last reported global rate

323

Skulltaker Halo 3: Catch

Halo 3: Find and claim the Catch Skull on Normal or harder.

Very rare

2.90%last reported global rate

324

TLDR

Halo CE: Beat the par time on The Library.

Very rare

2.90%last reported global rate

325

Winter Urgency

Halo: Reach: Beat the par time on Winter Contingency.

Very rare

2.90%last reported global rate

326

Aim for the Head

Earn a total of 2,500 Headshot medals in multiplayer.

Very rare

3.00%last reported global rate

327

Cowardly Grunt

Halo 2: Listen to the Cowardly Grunt's woes.

Very rare

3.00%last reported global rate

328

Headstrong

Halo CE: Beat the par score on Keyes.

Very rare

3.00%last reported global rate

329

Scorched Earth

Halo 2: Beat the par score on High Charity.

Very rare

3.00%last reported global rate

330

Skulltaker Halo 3: Tilt

Halo 3: Find and claim the Tilt Skull on Normal or harder.

Very rare

3.00%last reported global rate

331

Departure

Halo 4: Complete all chapters in Spartan Ops Episode 1.

Very rare

3.10%last reported global rate

332

Inundation

Halo 3: Activate Terminal 2 on The Ark.

Very rare

3.10%last reported global rate

333

Quicker Than Reading the Book

Halo: Reach: Beat the par time on Exodus.

Very rare

3.10%last reported global rate

334

Window Shopping

Halo 2: Complete a match on at least 4 different game types in classic multiplayer.

Very rare

3.10%last reported global rate

335