"The Sacrifice” is the new add-on for Left 4 Dead.
DEAD WRECKENING
Not unlocked yetDole out 5000 total Survivor damage as a Special Infected.
LAMB 2 SLAUGHTER
Not unlocked yetAs an Infected, incap a Survivor who has entered and left a safe room.
OUTBREAK
Not unlocked yetCatch a rare strain of infection, then pass it on to someone else.
LAST STAND
Not unlocked yetComplete one round of Survival on The Last Stand.
BRONZE METTLE
Not unlocked yetEarn a Bronze medal in Survival mode on any official level.
SILVER BULLETS
Not unlocked yetEarn a Silver medal in Survival mode on any official level.
VIOLENCE IS GOLDEN
Not unlocked yetEarn a Gold medal in Survival mode on any official level.
DISTINGUISHED SURVIVOR
Not unlocked yetEarn at least a Bronze medal on every official Survival level.
HEROIC SURVIVOR
Not unlocked yetEarn at least a Silver medal on every official Survival level.
LEGENDARY SURVIVOR
Not unlocked yetEarn a Gold medal on every official Survival level.
CRASH-PROOF
Not unlocked yetSurvive the Crash Course Campaign.
QUICK POWER
Not unlocked yetRestart the generator within 30 seconds of it shutting off.
THE LITTLEST GENOCIDE
Not unlocked yetKill 5,359 Infected in the Crash Course campaign.
SMASH HIT
Not unlocked yetWin a Versus campaign of Crash Course.
TRUCK STOP
Not unlocked yetYour team wipes all Survivors after the escape vehicle has opened in Crash Course.
20 CAR PILE-UP
Not unlocked yetAs A Tank hit 20 Survivors with a car in the Crash Course campaign.
JUMPIN' JACK SMASH
Not unlocked yetPounce a Survivor for 25 points of damage in the Crash Course campaign.
SLIPPERY PULL
Not unlocked yetSmoker pull a bile-covered Survivor until you hold him during Crash Course.
TANK STUMBLE
Not unlocked yetStun a Tank with an explosion in the Crash Course campaign.
WIPEFEST
Not unlocked yetYour team incapacitates three Survivors within five seconds.
Supreme Sacrifice
Not unlocked yetComplete "The Sacrifice".
Kill Bill
Not unlocked yetHave Bill sacrifice himself for the team.
Barrel Rolled
Not unlocked yetKill a Special Infected with an exploding barrel.
Chaos Generator
Not unlocked yetHave all 3 generators running at once in "The Sacrifice" finale.