Left 4 Dead

51 of 73 ach. unlocked (70%)
Frost's achievements in Left 4 Dead
Set 101 Infected on fire.
Survive an entire campaign using only pistols.
Leave a safe room to save an incapped teammate and bring them back safely.
Cover four Survivors with Boomer bile at once.
Mar 13, 10
You or another Survivor take no damage after being vomited on by a Boomer.
Make 100 headshot kills.
Earn a Bronze medal in Survival mode on any official level.
Light a Witch with a Molotov.
Constrict two Survivors on one life as a Smoker.
Shove a Boomer and then kill him without him splashing on anyone.
Kill a Witch with a single headshot.
Survive the Crash Course Campaign.
Sep 29, 09
Survive the Dead Air campaign.
Heal a fellow Survivor when your own health is below 10.
Punch a Hunter as he is pouncing.
Earn at least a Bronze medal on every official Survival level.
Sneak past all Witches in a campaign without disturbing one.
Pounce two different Survivors on one life as a Hunter.
Rescue a Survivor from a Smoker's tongue before he takes damage.
Heal 25 Survivors with a first aid kit.
Nov 3, 09
Survive the Blood Harvest campaign.
Save another Survivor from a Special Infected while on the ground.
Revive 50 incapacitated Survivors.
Rescue a Survivor trapped in a closet.
Shove a Hunter off of a pinned and helpless Survivor.
Headshot a Hunter while he's leaping.
Complete one round of Survival on The Last Stand.
Single-handedly kill a Tank.
Survive the No Mercy campaign.
Protect any Survivor from an attacking Infected 50 times.
Kill 10 Smokers as they are pulling helpless Survivors.
Beat a campaign with all 4 Survivors.
Catch a rare strain of infection, then pass it on to someone else.
Give pain pills to 10 Survivors.
Blow up 20 Infected in a single explosion.
Restart the generator within 30 seconds of it shutting off.
Sep 29, 09
Kill 1000 Infected with a mounted machine gun.
Play an entire campaign with no Survivors taking friendly fire damage.
Apr 24, 10
Earn a Silver medal in Survival mode on any official level.
Win a Versus campaign of Crash Course.
Nov 6, 09
Kill an Infected with a single blow from behind.
Survive a campaign without being incapacitated.
All Survivors complete a campaign without being vomited on.
Kill a Tank without it dealing any damage to a Survivor.
Survive the Death Toll campaign.
Kill a Smoker who has grabbed you with his tongue.
Light a Tank with a Molotov.
Finish a campaign without ever using a first aid kit on yourself.
Earn a Gold medal in Survival mode on any official level.
Kill a Witch without any Survivor taking damage from her.
Survive any campaign on Expert.
Nov 14, 09
As A Tank hit 20 Survivors with a car in the Crash Course campaign.
Kill all four Survivors on one life as a Tank.
Kill a Special Infected with an exploding barrel.
Drag a Survivor 100 feet with your tongue as a Smoker.
Have all 3 generators running at once in "The Sacrifice" finale.
Dole out 5000 total Survivor damage as a Special Infected.
Earn at least a Silver medal on every official Survival level.
Pounce a Survivor for 25 points of damage in the Crash Course campaign.
Have Bill sacrifice himself for the team.
As an Infected, incap a Survivor who has entered and left a safe room.
Earn a Gold medal on every official Survival level.
Survive a campaign with no Survivors taking damage from Special Infected.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Smoker pull a bile-covered Survivor until you hold him during Crash Course.
Complete "The Sacrifice".
Stun a Tank with an explosion in the Crash Course campaign.
Kill 5,359 Infected in the Crash Course campaign.
Your team wipes all Survivors after the escape vehicle has opened in Crash...
No Survivors take damage after contacting the rescue vehicle.
Survive all campaigns on Expert.
Your team incapacitates three Survivors within five seconds.
Kill 53,595 Infected.