Left 4 Dead achievements

As a Special Infected, incap someone who is trying to sacrifice themselves.

Earn a Gold medal on every official Survival level.

Earn at least a Silver medal on every official Survival level.

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.

Kill a Special Infected with an exploding barrel.

Earn at least a Bronze medal on every official Survival level.

Survive a campaign with no Survivors taking damage from Special Infected.

As a Tank hit 20 Survivors with a car in the Crash Course campaign.

Smoker pull a bile-covered Survivor until you hold him during Crash Course.

Kill 53,595 Infected.