Full list of all 65 Left 4 Dead achievements worth 1,500 gamerscore. It takes around 40-50 hours to unlock all of the achievements in the base game on Xbox 360.
The base game contains 50 achievements worth 1,000 Gamerscore, and there are 3 DLC packs containing 15 achievements worth 500 Gamerscore.
Kill a Tank without it dealing any damage to a Survivor.
Kill a Witch without any Survivor taking damage from her.
Survive a campaign with no Survivors taking damage from Special Infected.
Survive all campaigns on Expert.
Kill all four Survivors in one life while playing as a Tank.
As an Infected, incap a Survivor who has entered and left a safe room.
Kill 53,595 Infected.
Survive any campaign on Expert.
No Survivors take damage after contacting the rescue vehicle.
All Survivors complete a campaign without being vomited on.
Survive a campaign without being incapacitated.
Play an entire campaign with no Survivors taking friendly fire damage.
Single-handedly kill a Tank.
Headshot a Hunter while he's leaping.
Cover four Survivors with Boomer bile at once.
Finish a campaign without ever being healed.
Kill 1000 Infected with a mounted machine gun.
Revive 50 incapacitated Survivors.
Drag a Survivor 100 feet with your tongue.
Dole out 5000 total Survivor damage as a Special Infected.
Sneak past all Witches in a campaign without disturbing one.
Pounce two different Survivors in one life as a Hunter.
Constrict two Survivors in one life as a Smoker.
Leave a safe room to save an incapped teammate and bring them back safely.
Heal a fellow Survivor when your own health is below 10.
Kill a Witch with a single headshot.
Give pain pills to 10 Survivors.
Survive the Blood Harvest campaign.
Survive an entire campaign using only pistols.
Heal 25 Survivors with a first aid kit.
Punch a Hunter as he is pouncing.
Light a Tank with a Molotov.
Survive the Dead Air campaign.
Set 101 Infected on fire.
Kill an Infected with a single blow from behind.
Survive the No Mercy campaign.
Beat a campaign with all 4 Survivors.
Shove a Boomer and then kill him without him splashing on anyone.
Save another Survivor from a Special Infected while on the ground.
Blow up 20 Infected in a single explosion.
Shove a Hunter off of a pinned and helpless Survivor.
Kill 10 Smokers as they are pulling helpless Survivors.
Survive the Death Toll campaign.
You or another Survivor take no damage after being vomited on by a Boomer.
Protect any Survivor from an attacking Infected 50 times.
Light a Witch with a Molotov.
Make 100 headshot kills.
Free yourself from a Smoker who has grabbed you with his tongue.
Rescue a Survivor trapped in a closet.
Rescue a Survivor from a Smoker's tongue before he takes damage.
Smoker pull a bile-covered Survivor until you hold him during Crash Course.
Your team incapacitates three Survivors within five seconds in the Crash Course campaign.
Your team wipes all Survivors after the escape vehicle has opened in Crash Course.
Kill 5,359 Infected in the Crash Course campaign.
Pounce a Survivor for 25 points of damage in the Crash Course campaign.
Win a Versus campaign of Crash Course.
Survive the Crash Course Campaign.
Restart the generator within 30 seconds of it shutting off in the Crash Course campaign.
Stun a Tank with an explosion in the Crash Course campaign.
As a Tank hit 20 Survivors with a car in the Crash Course campaign.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Kill a Special Infected with an exploding barrel.
Have all 3 generators running at once in "The Sacrifice" finale.
Have Bill sacrifice himself for the team.
Complete "The Sacrifice".