Armor customization (Halo 4)/Helmet

From Halopedia, the Halo wiki

Helmets
Helmet Unlock (Halo 4) Unlock (Halo: The Master Chief Collection) Skins Unlock (Halo 4) Unlock (Halo: The Master Chief Collection)
Aviator SR-11 Unlocked by default VERG Complete Vehicle Mastery Commendation Unlocked by default on Season 4 update
VISN Classified Flying Colors archive Unlocked by default on Season 4 update
Aviator SR-17 Unlocked by default BOND Complete Wheelman Commendation Unlocked by default
CIO Complete Spartan Slayer Commendation Unlocked by default WEB Pre-order Halo 4 from Amazon.com Unlocked by default on Season 4 update
RUIN Buy the Spartan CIO figure from McFarlane Toys' Halo 4 Series 2 Unlocked by default on Season 4 update
RUSH Classified Flying Colors archive Unlocked by default on Season 4 update
Commando Complete Dominion Victory Commendation Unlocked by default FRCT Complete Flood Victory Commendation Unlocked by default on Season 4 update
Deadeye Pre-order Halo 4 from Best Buy or Play.com Unlocked by default N/A
Defender SR-24 Unlocked by default CTRL Complete Bullet in the Brain Commendation Unlocked by default on Season 4 update
CLMN Buying the Champions Bundle Unlocked by default on Season 4 update
Enforcer SR-50 Unlocked by default TRBL Complete Mounted Turret Commendation Unlocked by default on Season 4 update
TRCR Buying the Champions Bundle Unlocked by default on Season 4 update
Engineer EN-4 Unlocked by default EDGE EN-9 Unlocked by default on Season 4 update
EOD SR-45 Unlocked by default SHWD Complete Regicide Victory Commendation Unlocked by default on Season 4 update
EVA SR-27 Unlocked by default BRCH Complete Hail of Death Commendation Unlocked by default on Season 4 update
FOTUS Buying Halo 4 Limited Edition Console Unlocked by default N/A
GUNGNIR Complete Slayer Victory Commendation Unlocked by default PULS Pre-order Halo 4 from Microsoft Unlocked by default on Season 4 update
HAZOP SR-43 Unlocked by default FRST Pre-order Halo 4 from GameStop Unlocked by default on Season 4 update
Infiltrator SR-42 Unlocked by default TRAC Complete Multikill Commendation Unlocked by default on Season 4 update
PYTN Buying the Champions Bundle Unlocked by default on Season 4 update
HTMCC H4 Keystone Helmet Icon.png
Keystone
N/A Season 7: Elite, Purchase in The Exchange (Season point 0) N/A
Locus Pre-order Halo 4 from MightyApe.co.nz or HMV.com Unlocked by default N/A
HTMCC H4 MarkV Helmet Icon.png
Mark V
Buying the Infinity Armor Pack or the Champions Bundle Season 7, Tier 2 (Season point 1) N/A
Mark VI Complete Legend Commendation Unlocked by default N/A
Oceanic SR-47 Unlocked by default CRCT Pre-order Halo 4 from Walmart Unlocked by default on Season 4 update
SLID Buying the Champions Bundle Unlocked by default on Season 4 update
HTMCC H4 ODST Helmet Icon.png
ODST
Buying the Infinity Armor Pack or the Champions Bundle Season 7, Tier 68 (Season point 1) N/A
Operator OP-4 Unlocked by default SRFC OP-9 Unlocked by default on Season 4 update
Orbital SR-41 Unlocked by default AEON Complete Covenant Destroyer Commendation Unlocked by default on Season 4 update
SWFT Enter Section 3 code YANUMAS Unlocked by default on Season 4 update
Pathfinder PT-4 Unlocked by default CORE PT-9 Unlocked by default on Season 4 update
Pioneer PR-4 Unlocked by default ADPT PR-9 Unlocked by default on Season 4 update
HTMCC H4 Prefect Helmet Icon.png
Prefect
Buying the Infinity Armor Pack or the Champions Bundle Season 7, Tier 36 (Season point 1) N/A
Protector Complete UNSC Loadout Mastery Commendation Unlocked by default DRFT Complete Weapon Mastery Commendation Unlocked by default on Season 4 update
Raider Classified Requiem Archive I archive Unlocked by default DSST Classified Requiem Archive II archive Unlocked by default on Season 4 update
Ranger Complete Combat Opportunity Commendation Unlocked by default STRK Complete Protector Commendation Unlocked by default on Season 4 update
Recon SR-26 Unlocked by default SURG Complete Covenant Loadout Mastery Commendation Unlocked by default on Season 4 update
Recruit Unlocked by default Unlocked by default PRME Buying Halo 4 Limited Edition Unlocked by default on Season 4 update
HTMCC H4 Ricochet Helmet Icon.png
Ricochet
Buying the Bullseye Pack or the Champions Bundle Season 7, Tier 18 (Season point 1) HTMCC H4 Ricochet HMTM Helmet Icon.png
HMTM
Buying the Bullseye Pack or the Champions Bundle Season 7, Tier 18 (Season point 1)
Rogue RG-4 Unlocked by default FCUS RG-9 Unlocked by default on Season 4 update
Scanner Buying the War Games Map Pass Unlocked by default N/A
Scout SR-38 Unlocked by default APEX Complete Oddball Victory Commendation Unlocked by default on Season 4 update
TOXC Buy the Spartan Scout figure from McFarlane Toys' Halo 4 Series 2 Unlocked by default on Season 4 update
Soldier SR-15 Unlocked by default ZNTH Complete Killing Spree Commendation Unlocked by default on Season 4 update
Stalker SK-4 Unlocked by default CRSH SK-9 Unlocked by default on Season 4 update
Strider Buying the War Games Map Pass Unlocked by default N/A
Tracker TK-4 Unlocked by default ADRT TK-9 Unlocked by default on Season 4 update
Vanguard Complete Forerunner Destroyer Commendation Unlocked by default CNVG Complete Flag Victory Commendation Unlocked by default on Season 4 update
Venator Complete Assassin Commendation Unlocked by default RPTR Pre-order Halo 4 from Best Buy Unlocked by default on Season 4 update
BYNT Buying the Champions Bundle Unlocked by default on Season 4 update
RFCT Buying the Didact figure from McFarlane Toys' Halo 4 Series 2 Unlocked by default on Season 4 update
War Master SR-37 Unlocked by default PRML Complete King of the Hill Victory Commendation Unlocked by default on Season 4 update
Warrior SR-8 Unlocked by default MTRX Complete Forerunner Loadout Mastery Commendation Unlocked by default on Season 4 update
Wetwork WK-4 Unlocked by default PRML WK-9 Unlocked by default on Season 4 update