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