Halo 4’s unlock system is tied into Spartan Ranks, the new leveling system that has been implemented in Halo 4. Players rank up by earning experience.This can be done by participating in the game’s competitive multiplayer, completing challenges, earning commendations and taking part in the game’s Spartan Ops mode.

The maximum Spartan Rank available is level 50 and with each additional rank you earn, you will unlock additional weapons, armor abilities, support upgrades, tactical packages and other various character improvements including additional custom load-outs, and armor sets. Each level gained will also earn a Spartan Point which can be used to purchase unlocked firepower.

Here’s a list of Ranks and unlocks I know of so far:

Complete List¶

SR Rank 01:

> Primary Weapon —> Assault Rifle

> Secondary Weapon -> Magnum

> Grenade –––––> Frag Grenades

SR Rank 02:

> Primary Weapon —> DMR

> Primary Weapon —> Battle Rifle

SR Rank 03:

> Unlock Armor Abilities

> Armor Ability ––> Promethean Vision

> Armor Ability ––> Thruster Pack

SR Rank 04:

> Customisation ––> Foreground Emblems 1

SR Rank 05:

> Primary Weapon —> Covenant Carbine

> Primary Weapon —> Storm Rifle

SR Rank 06:

> Load out ———> Unlock Additional Load-out Slot 2

> Armor Ability ––> Hologram

> Armor Ability ––> Jet Pack

SR Rank 07:

> New Ability ——> Unlock Tactical Packages

> Tactical Packages-> Shielding

> Tactical Packages-> Mobility

SR Rank 08:

> Armor Unlock —–> warrior Helmet

> Armor Unlock —–> warrior Torso

> Armor Unlock —–> warrior Left Shoulder

> Armor Unlock —–> Warrior Right Shoulder

> Grenade –––––> Plasma Grenades

> Secondary Weapon -> Plasma Pistol

SR Rank 09:

> Armor Unlock ——> Forearms - Twin-Plated

SR Rank 10:

> Armor Unlock —–> Legs - RG63 Couter

> Armor Ability ––> Hardlight Shield

> Armor Ability ––> Active Camoflage

SR Rank 11:

> Armor Unlock —–> Air Assault Helmet

> Armor Unlock —–> Air Assault Torso

> Armor Unlock —–> Air Assault Left Shoulder

> Armor Unlock —–> Air Assault Right Shoulder

SR Rank 12:

> New Ability ——> Unlock Support Upgrades

> Support Upgrade –> Ammo

> Support Upgrade –> Dexerity

SR Rank 13:

> Customisation ––> Unlock Heroic Stance on Player card

SR Rank 14:

> Loadout –––––> Unlock Additional Load-out Slot 3

> Tactical Packages-> Resupply

> Tactical Packages-> AA Efficiency

SR Rank 15:

> Armor Unlock —–> Soldier Helmet

> Armor Unlock —–> Soldier Torso

> Armor Unlock —–> soldier Left Shoulder

> Armor Unlock —–> soldier Right Shoulder

SR Rank 16:

> Armor Ability ––> Autosentry

> Armor Ability ––> Regeneration Field

SR Rank 17:

> Armor Unlock —–> Aviator Helmet

> Armor Unlock —–> Aviator Torso

> Armor Unlock —–> Aviator Left Shoulder

> Armor Unlock —–> Aviator Right Shoulder

SR Rank 18:

> Grenade –––––> Pulse Grenades

> Secondary Weapon -> Bolt Shot

SR Rank 19:

> Customisation ––> Foreground Emblems 2

SR Rank 20:

> Armor Unlock —–> Solar Visor

> Support Upgrade –> Awareness

> Support Upgrade –> Sensor

SR Rank 21:

> Customisation ––> Unlock Background for Emblems

> Armor Unlock —–> Defender Helmet

> Armor Unlock —–> Defender Torso

> Armor Unlock —–> Defender Left Shoulder

> Armor Unlock —–> Defender Right Shoulder

SR Rank 22:

> Armor Unlock —–> Forearms - GV-09 Locking

> Primary Weapon —> Light Rifle

> Primary Weapon —> Suppressor

SR Rank 23:

> Armor Unlock —–> LG-50 Bulk Legs

SR Rank 24:

> Tactical Packages-> Grenadier

> Tactical Packages-> Firepower

SR Rank 25:

> N/A

SR Rank 26:

> Loadout –––––> Unlock Additional Load-out Slot 4

> Armor Unlock —–> Recon Helmet

> Armor Unlock —–> Recon Torso

> Armor Unlock —–> Recon Left Shoulder

> Armor Unlock —–> Recon Right Shoulder

> Support Upgrade –> Explosives

> Support Upgrade –> Ordinance Priority

SR Rank 27:

> Armor Unlock —–> EVA Helmet

> Armor Unlock —–> EVA Torso

> Armor Unlock —–> EVA Left Shoulder

> Armor Unlock —–> EVA Right Shoulder

SR Rank 28:

> Customisation ––> Foreground Emblems 3

SR Rank 29:

> Armor Unlock —–> Frost Visor

SR Rank 30:

> Armor Unlock —–> Forearms - Inner-Plated

SR Rank 31:

> Armor Unlock —–> Legs - Outer-Plated

SR Rank 32:

> Customisation ––> Unlock Assassin Stance on Player card

SR Rank 33:

> Customisation ––> Background Emblems 2

SR Rank 34:

> Armor Unlock —–> Forearms - Outer-Plated

SR Rank 35:

> Armor Unlock —–> Legs - XG89 Narrow

SR Rank 36:

> Customisation ––> Foreground Emblems 4

SR Rank 37:

> Armor Unlock —–> war Master Helmet

> Armor Unlock —–> War Master Torso

> Armor Unlock —–> War Master Left Shoulder

> Armor Unlock —–> War Master Right Shoulder

SR Rank 38:

> Armor Unlock —–> Scout Helmet

> Armor Unlock —–> Scout Torso

> Armor Unlock —–> Scout Left Shoulder

> Armor Unlock —–> Scout Right Shoulder

SR Rank 39:

> Armor Unlock —–> Forearms - Contoured

SR Rank 40:

> Armor Unlock —–> Legs - Contoured

SR Rank 41:

> Loadout –––––> Unlock Additional Load-out Slot 5

> Armor Unlock —–> Orbital Helmet

> Armor Unlock —–> Orbital Torso

> Armor Unlock —–> Orbital Left Shoulder

> Armor Unlock —–> orbital Right Shoulder

SR Rank 42:

> Armor Unlock —–> Infiltrator Helmet

> Armor Unlock —–> Infilrator Torso

> Armor Unlock —–> Infiltrator Left Shoulder

> Armor Unlock —–> infiltrator Right Shoulder

SR Rank 43:

> Armor Unlock —–> Hazop Helmet

> Armor Unlock —–> Hazop Torso

> Armor Unlock —–> Hazop Left Shoulder

> Armor Unlock —–> Hazop Right Shoulder

SR Rank 44:

> Customisation ––> Background Emblems 3

SR Rank 45:

> Armor Unlock —–> EOD Helmet

> Armor Unlock —–> EOD Torso

> Armor Unlock —–> EOD Left Shoulder

> Armor Unlock —–> EOD Right Shoulder

SR Rank 46:

> Armor Unlock —–> Midnight Helmet

SR Rank 47:

> Armor Unlock —–> Oceanic Helmet

> Armor Unlock —–> Oceanic Torso

> Armor Unlock —–> Oceanic Left Shoulder

> Armor Unlock —–> Oceanic Right Shoulder

SR Rank 48:

> Armor UNlock —–> Forearms - XV27 Shifting

SR Rank 49:

> Armor Unlock —–> Legs - Overlocking

SR Rank 50:

> Armor Unlock —–> Enforcer Helmet

> Armor Unlock —–> Enforcer Torso

> Armor Unlock —–> Enforcer Left Shoulder

> Armor Unlock —–> Enforcer Right Shoulder

> Customisation ––> Unlock Last Stand Stance on Player card

> Unlock specialisation - Wetwork

> Unlock specialisation - Operator

> Unlock specialisation - Pioneer

> Unlock specialisation - Engineer

> Unlock specialisation - Tracker

> Unlock specialisation - Rogue

> Unlock specialisation - Stalker

> Unlock specialisation - Pathfinder