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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.

101

Skulltaker Halo 2: IWHBYD

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

Very rare

1.20%last reported global rate

102

Strong, Silent Type

H3: ODST: Assassinate 3 Brutes in a row on Data Hive.

Very rare

1.20%last reported global rate

103

Toybox

Halo 2: Collect all eight Halo toys.

Very rare

1.20%last reported global rate

104

Whistle Stop Tour

Halo CE: Beat the par time on Two Betrayals.

Very rare

1.20%last reported global rate

105

Why So Serious

Halo 2: View the smiling face in the classic multiplayer map Coagulation.

Very rare

1.20%last reported global rate

106

Zealot

Halo 2A MP: In Anniversary matchmaking, win 10 games as an Elite.

Very rare

1.20%last reported global rate

107

All You Can Eat

Halo CE: Beat the par time on The Maw.

Very rare

1.30%last reported global rate

108

Bill Past Due

H3: ODST: Beat the par time on Tayari Plaza.

Very rare

1.30%last reported global rate

109

BLASTacular!

Halo 2A MP: Destroyed all the Halo 2 Anniversary Multiplayer BLAST soda cans.

Very rare

1.30%last reported global rate

110

Bloody Thirsty!

Halo 2A MP: Found and destroyed the BLAST soda can on Bloodline.

Very rare

1.30%last reported global rate

111

Brainpan

Halo 3: Find all the hidden multiplayer Skulls.

Very rare

1.30%last reported global rate

112

Canonical Conundrum

Halo: Reach: Find all Data Pads.

Very rare

1.30%last reported global rate

113

Chieftain of the Brutes

Halo 2: Collect the Tartarus toy in Quarantine Zone.

Very rare

1.30%last reported global rate

114

Citadel Skull

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

Very rare

1.30%last reported global rate

115

Did You Major in Marine Bio?

Halo: Reach: Encounter the hidden marines on Exodus.

Very rare

1.30%last reported global rate

116

Fly, You Fools!

Halo: Reach: Find the hidden Banshees on The Package.

Very rare

1.30%last reported global rate

117

Gate Your Thirst!

Halo 2A MP: Found and destroyed the BLAST soda can on Stonetown.

Very rare

1.30%last reported global rate

118

Heretic Skull

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

Very rare

1.30%last reported global rate

119

High Altitude Thirst!

Halo 2A MP: Found and destroyed the BLAST soda can on Zenith.

Very rare

1.30%last reported global rate

120

Invasion

Halo 4: Complete all chapters in Spartan Ops Episode 7.

Very rare

1.30%last reported global rate