Alien Swarm Cheats - PC

Cheat Mode
Use the [~] key during gameplay and type in "sv_cheats 1" to enable cheat codes, then enter any of the following commands (can not be used in offline practice):

asw_god 1 - God mode.
asw_gimme_ammo - Full ammo.
asw_gimme_health - Full health.

Achievements (Steam)
Ammo Technician - Deploy 10 ammo stashes that are used by other marines.
Another Bughunt - Kill 5,000 Swarm.
Armory Access - Unlock all the available weapons.
Assault Specialist - Kill 250 Swarm with the Assault Rifle.
Autogun Expert - Kill 250 Swarm with an Autogun.
Blast Radius - Kill 6 Swarm with a single Grenade.
Brutal Campaign - Awarded for finishing the Jacobs campaign on Brutal difficulty.
Bug Stomper - Kill 100 Swarm Grubs.
Cargo Elevator Speed Run - Complete Cargo Elevator within 2:50 on Normal difficulty or harder without any marines dying.
Circuit Breaker - Complete 10 wire hacks without access being logged.
Clear Firing - Kill 25 drones without friendly fire. Four marines must be present in the mission.
Close Encounters - Kill 20 Swarm with melee attacks in a single mission.
Damage Amped - Kill 15 Swarm with all four marines under the effects of a Damage Amp in a single mission.
Deima Surface Bridge Speed Run - Complete Deima Surface Bridge within 2:30 on Normal difficulty or harder without any marines dying.
Easy Campaign - Complete the Jacob's Rest campaign on Easy difficulty or harder.
Electro-Stunned - Stun 6 Swarm with a single Stun Grenade.
Firewall Specialist - Kill 100 Swarm with Incendiary Mines.
Grenadier Expert - Kill 250 Swarm with a Grenade Launcher.
Group Heal - Heal all 4 marines with a single Heal Beacon.
Gunslinger - Successfully perform 5 fast reloads in a row.
Hard Campaign - Complete the Jacob's Rest campaign on Hard difficulty or harder.
Hardcore - Complete any mission on Brutal difficulty with Onslaught and Hardcore Friendly Fire enabled.
Hat Trick - Complete 2 co-op missions online. Earns a Team Fortress 2 parasite hat.
High Voltage Expert - Kill 250 Swarm with a Tesla Cannon.
Hornet Barrage Expert - Kill 100 Swarm with Hornet Barrages.
Infestation Savior - Cure an Infested marine.
Insane Campaign - Awarded for finishing the Jacob campaign on Insane difficulty.
Kill Them All - Kill 25,000 Swarm.
Landing Bay Speed Run - Complete Landing Bay within 1:25 on Normal difficulty or harder without any marines dying.
Minigun Master - Kill 250 Swarm with a Minigun.
Normal Campaign - Complete the Jacob's Rest campaign on Normal difficulty or harder.
Nuke From Orbit - Kill 100,000 Swarm.
On the Ready Line - Kill 1,000 Swarm.
Outstanding Execution - Complete a campaign on Normal difficulty or harder without any marines dying.
Parasite Puncher - Kill a Swarm Parasite with a melee attack.
Peace Medic - Heal 300 points of damage in a single mission without dealing any non-melee damage to the Swarm.
Perfect - Complete a mission on Normal difficulty or harder without receiving any damage.
Pistols Expert - Kill 250 Swarm with Twin Pistols.
Professional Marksman - Kill 250 Swarm with a Marksman Rifle.
Protect the Tech - Guard the squad's tech so that he takes no damage during the hack.
Prototype Professional - Kill 250 Swarm with a Prototype Rifle.
Pyrotechnician - Kill 250 Swarm with a Flamethrower.
Quick and Dead - Kill a Swarm Boomer before it inflates.
Quick Load - Successfully perform a fast reload.
Railgun Specialist - Kill 250 Swarm with a Rail Rifle.
Rydberg Reactor Speed Run - Complete Rydberg Reactor within 3:10 on Normal difficulty or harder without any marines dying.
Scrambled Eggs - Destroy all Swarm Eggs in a mission without allowing any to hatch.
Seal of Quality - Seal a door with the welder.
Security Expert - Complete 10 computer hacks without access being logged.
Sewer Junction Speed Run - Complete Sewer Junction within 1:30 on Normal difficulty or harder without any marines dying.
Sharpshooter - Complete a mission with better than 90% accuracy.
Shield Down - Deliver the finishing blow to a Swarm Shieldbug.
Short Controlled Bursts - Complete a mission with no friendly fire incidents. Four marines must be present in the mission.
Shotgun Specialist - Kill 250 Swarm with a Shotgun.
Slaughter Soldier - Kill 250 Swarm with a Chainsaw.
Small Arms Specialist - Kill 250 Swarm with PDWs.
Smoking Barrels - Kill 5 Swarm with explosive barrels in a single mission.
Static Defender - Kill 500 Swarm with deployable Sentry Guns.
Stay Frosty - Freeze 6 Swarm with a single Freeze Grenade.
SynTek Residential Speed Run - Complete SynTek Residential within 2:30 on Normal difficulty or harder without any marines dying.
Tactical Explosives Expert - Kill 100 Swarm with Laser Tripmines.
Technician Secured - Finish a mission without the tech getting killed.
Timor Station Speed Run - Complete Timor Station within 4:25 on Normal difficulty or harder without any marines dying.
Under the Gun - Roll under a Swarm Ranger projectile.
Vindicator Veteran - Kill 250 Swarm with a Vindicator.
Zero Mortality - Complete a mission on Normal difficulty or harder without any marines dying.

Unlock Promotion stars
Reach level 27 and hit promote. It will reset your levels, but you will have the promotion stars:

Titanium Star - 1st promotion.
Carbide Star - 2nd promotion.
Gallium Cross - 3rd Promotion.
Platinum Star - 4th Promotion.
Osmium Star - 5th Promotion.
Iridium Medallion - 6th Promotion.