Unlock the following awards by performing the corresponding tasks in Single-Player mode:

Annihilator Award - Kill 1,000 enemies.
Campaign Award - Beat all missions.
Carbonizer Mk16 Award - Kill 250 with the Carbonizer Mk16.
Deatomizer Mk4 Award - Kill 250 with the Deatomizer Mk4.
Deatomizer Mk9 Award - Kill 100 with the Deatomizer MK9.
Drone Hunter - Kill 250 Drones
Frag Grenade Award - Kill 250 enemies with the Frag Grenade.
Hive Cannon Award - Kill 250 enemies with the Hive Cannon.
HVS45 Award - Kill 100 enemies with the HVS45
Invader Hunter - Kill 25 Invaders
Med-Mite Hunter - Kill 125 Med-Mites
MP5KA4 Award - Kill 250 enemies with the MP5KA4.
Para-Mite Hunter - Kill 75 Para-Mites
Puppet Hunter - Kill 250 Puppets
Radiation Grenade Award - Kill 250 enemies with the Radiation Grenade.
SCAR Award - Kill 250 enemies with the SCAR
Scarab Hunter - Kill 100 Scarabs
Secret Master - Find all secrets.
Shrieker Award - Kill 250 enemies with the Shrieker.
Skimmer Hunter - Kill 100 Skimmers
SMAW Award - Kill 250 enemies with the SMAW
SPAS 12 Award - Kill 250 enemies with the SPAS 12
Storm Scarab Hunter - Kill 50 Storm Scarabs.
Strike Rifle Award - Kill 250 enemies with the Strike Rifle
Striker Award - Kill 100 enemies with the Striker
Tear-Mite Hunter - Kill 250 Tear-Mites
Therm-Mite Hunter - Kill 200 Therm-Mites
TPC Launcher Award - Kill 250 enemies with the TPC Launcher
Trust Hunter - Kill 200 Trusts
USP45 Award - Kill 250 enemies with the USP45
Warp Pistol Award - Kill 250 enemies with the Warp Pistol

Activate the following cheats by entering the corresponding case-sensitive codes:

Custom ASE skin - "NewASE11"
Secret Agent skin - "SuitMP13"
Drone(single player) - "Drone4SP"

Unlock the following cheats in Single-Player mode by completing the corresponding tasks:

Fiery Death(enemies disintegrate) -  Earn the "Secret Master" achievement by finding all secrets in all single player missions. When this cheat is activated, enemies die as if they were killed by a charged shot.

Fully Stocked(infinite ammo) - Earn the "Annihilator Award" achievement by killing 1,000 enemies.

Stopping Power(one-shot kills) - Earn the "Campaign Award" achievement by completing all single player missions.

To unlock the Concept Art Galleries, collect ten conspiracy data disks. There are a total of six galleries that can be unlocked.

To keep a weapon charged, charge a shot, melee attack, and reload. You will not have to hold the button to keep it charged.

To avoid receiving damage from falling in Multiplayer mode, pause the game while you are in freefall to float.