Here is the full list of all 66 Alien Swarm achievements.
Complete Timor Station within 4:25 on Normal difficulty or harder without any marines dying.
Complete SynTek Residential within 2:30 on Normal difficulty or harder without any marines dying.
Complete Deima Surface Bridge within 2:30 on Normal difficulty or harder without any marines dying.
Complete Landing Bay within 1:25 on Normal difficulty or harder without any marines dying.
Complete Cargo Elevator within 2:50 on Normal difficulty or harder without any marines dying.
Complete 10 computer hacks without access being logged.
Complete any mission on Brutal difficulty with Onslaught and Hardcore Friendly Fire enabled.
Complete Sewer Junction within 1:30 on Normal difficulty or harder without any marines dying.
Complete a campaign on Normal difficulty or harder without any marines dying.
Kill 100,000 Swarm.
Kill 25,000 Swarm.
Kill 250 Swarm with a Tesla Cannon.
Awarded for finishing the Jacob campaign on Brutal difficulty.
Kill 15 Swarm with all four marines under the effects of a Damage Amp in a single mission.
Complete a mission on Normal difficulty or harder without receiving any damage.
Kill 250 Swarm with a Grenade Launcher.
Kill 250 Swarm with a Marksman Rifle.
Kill 250 Swarm with a Rail Rifle.
Kill 500 Swarm with deployable Sentry Guns.
Complete Rydberg Reactor within 3:10 on Normal difficulty or harder without any marines dying.
Kill 5,000 Swarm.
Kill 250 Swarm with a Minigun.
Kill 100 Swarm with Incendiary Mines.
Heal 300 points of damage in a single mission without dealing any non-melee damage to the Swarm.
Kill 250 Swarm with PDWs.
Deploy 10 ammo stashes that are used by other marines.
Kill 250 Swarm with a Shotgun.
Kill 100 Swarm with Laser Tripmines.
Kill 250 Swarm with a Vindicator.
Kill 100 Swarm Grubs.
Kill 250 Swarm with Twin Pistols.
Kill 250 Swarm with a Chainsaw.
Kill 100 Swarm with Hornet Barrages.
Complete a mission with no friendly fire incidents. Four marines must be present in the mission.
Kill 250 Swarm with a Prototype Rifle.
Awarded for finishing the Jacob campaign on Insane difficulty.
Freeze 6 Swarm with a single Freeze Grenade.
Kill 6 Swarm with a single Grenade.
Unlock all the available weapons.
Guard the squad's tech so that he takes no damage during the hack.
Complete 10 wire hacks without access being logged.
Kill 250 Swarm with a Flamethrower.
Stun 6 Swarm with a single Stun Grenade.
Complete the Jacob's Rest campaign on Easy difficulty or harder.
Complete the Jacob's Rest campaign on Normal difficulty or harder.
Complete the Jacob's Rest campaign on Hard difficulty or harder.
Destroy all Swarm Eggs in a mission without allowing any to hatch.
Kill 1,000 Swarm.
Kill a Swarm Parasite with a melee attack.
Successfully perform 5 fast reloads in a row.
Kill 250 Swarm with an Autogun.
Kill 25 drones without friendly fire. Four marines must be present in the mission.
Kill a Swarm Boomer before it inflates.
Kill 5 Swarm with explosive barrels in a single mission.
Seal a door with the welder.
Roll under a Swarm Ranger projectile.
Kill 250 Swarm with the Assault Rifle.
Cure an Infested marine.
Complete a mission with better than 90% accuracy.
Deliver the finishing blow to a Swarm Shieldbug.
Heal all 4 marines with a single Heal Beacon.
Complete 2 co-op missions online. Earns a Team Fortress 2 parasite hat.
Kill 20 Swarm with melee attacks in a single mission.
Successfully perform a fast reload.
Finish a mission without the tech getting killed.
Complete a mission on Normal difficulty or harder without any marines dying.