Full list of all 65 Left 4 Dead 2 achievements worth 1,500 gamerscore. It takes around 20-25 hours to unlock all of the achievements in the base game.
The base game contains 50 achievements worth 1,000 Gamerscore, and there are 2 DLC packs containing 15 achievements worth 500 Gamerscore.
Survive all campaigns on Expert.
Survive a campaign on Expert skill with Realism mode enabled.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
In a Survival round, get a medal only using melee weapons.
Kill 15 Infected with a single grenade launcher blast.
Navigate the sugar mill and reach the safe room without killing any Witches.
Defend yourself at the crashed airliner without taking damage.
Honk the noses of 10 Clowns.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Kill a Charger with a melee weapon while they are charging.
As the Jockey, ride a Survivor for more than 12 seconds.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
Cross the bridge finale in less than three minutes.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Kill 10 swampy Mudmen while they are in the water.
Kill a Tank with melee weapons.
Kill 100 Common Infected with the chainsaw.
Prove you are faster than Moustachio.
Prove you are stronger than Moustachio.
Rescue Gnome Chompski from the Carnival.
As the Jockey, ride the Survivors twice in a single life.
As the Charger, grab a Survivor and carry them over 80 feet.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
As the Spitter, spit on a Survivor being choked by a Smoker.
Cause 25 gas can drops as a Special Infected.
Collect 100 gas cans in Scavenge.
As the Charger, bowl through the entire enemy team in a single charge.
Collect 15 gas cans in a single Scavenge round.
As the Spitter, hit every Survivor with a single acid patch.
Make a Survivor drop a gas can during overtime.
Win a game of Scavenge.
Stop the enemy team from collecting any gas cans during a Scavenge round.
Ignite 50 Common Infected with incendiary ammo.
Revive 10 dead Survivors with the defibrillator.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Survive the Parish campaign.
Use every melee weapon to kill Common Infected.
Survive the Dark Carnival campaign.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Kill one of each Uncommon Infected.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Kill a Spitter before she is able to spit.
Survive the Dead Center campaign.
Survive the Swamp Fever campaign.
Decapitate 200 Infected with a melee weapon.
Deploy an ammo upgrade and have your team use it.
Use a bile bomb on a Tank.
Survive the Hard Rain campaign.
Finish a campaign using only melee weapons.
Using the M60, kill 25 infected without letting go of the trigger.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Play 5 full games of Scavenge on The Port.
Kill a Tank only with damage from the original Survivors.
Open 5 foot lockers.
Collect 10 items dropped by a Fallen Survivor.
Play 6 Mutations.
Survive The Passing Campaign.
Play the new Midnight Riders song on a jukebox.
Knock off the heads of 18 infected with the golf club.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Have all 3 generators running at once in "The Sacrifice" finale.
Kill a Special Infected with an exploding barrel.
Have Bill sacrifice himself for the team.
Complete "The Sacrifice".