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

Play a Versus game on Dead Air from start to finish.

Plays games with free weekend players and helps them survive a campaign.

Earn a bronze medal on any official Survival map.

Earn a silver medal on any official survival map.

Earn a gold medal on any official survival map.

Survive The Last Stand campaign on any difficulty.

Survive The Last Stand campaign on Expert Realism.

Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.

As the Spitter, spit on a Survivor who is pinned by a Charger.

As the Spitter, spit on a Survivor who is pinned by a Hunter.

Destroy 20 gascans as the Spitter.

Instantly kill a Survivor as the Charger.

As the Boomer, vomit on a Survivor without having direct line of sight with them.

Rescue three Survivors from a single rescue closet.

Kill a pouncing Hunter with a shotgun.

Kill the Witch bride with a single shotgun blast on expert difficulty.

As the Hunter, land a 25 damage pounce.

Kill 20 Jockeys with the shovel or pitchfork.

Survive for 10 minutes on any official map in Versus Survival.

Kill 53,599 infected. You made sure the dead won't rise anymore!

Escape Liberty Mall's Atrium before the first Tank appears

Discover the hidden room in the Last Stand campaign

Earn a bronze medal on every official survival map