The Covenant/Jul Covenant/New Covenant:

Plasma Pistol.

Needler.

Plasma Rifle.

Brute Plasma Rifle.

Fuel Rod Gun.

Energy Sword.

Covenant Carbine.

Beam Rifle.

Brute Shot.

Plasma Turret.

Brute Spiker.

Brute Mauler.

Brute Gravity Hammer.

Needle Rifle.

Plasma Repeater.

Concussion Rifle.

Focus Rifle.

Plasma Launcher.

Storm Rifle.

Plasma Grenades.

Spike Grenades.

Flame Grenades.

Banished:

Plasma Pistol.

Needler.

Gravity Hammer.

Energy Sword.

Mangler.

Skewer.

Ravager.

Stalker Rifle.

Sentinel Beam.

Heatwave.

Pulse Carbine.

Bulldog Shotgun(stolen from the UNSC).

MK50 Sidekick(stolen by the Grunt Mule).

Cindershot.

Shock Rifle.

M41 SPNKr(stolen from the UNSC).

VK-78 Commando Rifle(stolen from the UNSC).

Disruptor.

HYDRA(stolen from the UNSC).

Plasma Turret.

Plasma Grenade.

Spike Grenade.

Dynamo Grenade(which cause damage towards you or cause a EMP towards vehicles).

UNSC/Insurrectionist.

M7 SMG.

MA5C Assault Rifle/MA40 Assault Rifle.

Tactical Shotgun(soon be later replace by the Bulldog Shotgun).

Battle Rifle.

DMR.

M41 SPNKr.

Magnum(later replace by MK50 Sidekick).

M7057 Flamethrower.

Spartan Laser.

S7 Sniper Rifle.

Rail Gun(no longer use by the UNSC).

Grenade launcher.

M392 Bandit Rifle.

Chain Gun Turret.

Frag Grenade.

(Let me know if I miss any Halo Weaponry from Covenant, to UNSC, to the Banished, and I do apologize for not adding the images to the weapons, due of having 20 max limits for each chapter, and will take me a whole ass hour to find the correct weapons).