Defend yourself at the crashed airliner without taking damage.

Survive all campaigns on Expert.

Use a bile bomb on a Tank.

Cross the bridge finale in less than three minutes.

As the Hunter, land a 25 damage pounce.

Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.

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

Collect three gifts dropped by Special Infected in Versus Mode.

Play 6 Mutations.

Complete "The Sacrifice".

On the concert finale, survive until the helicopter arrives without leaving the stage

Decapitate 200 Infected with a melee weapon.

Deploy an ammo upgrade and have your team use it.

Destroy a Tank's rock in mid-air.

Earn a bronze medal on every official survival map

Earn a gold medal on every official survival map.

Earn a silver medal on every official survival map.

Escape Liberty Mall's Atrium before the first Tank appears

Discover the hidden room in the Last Stand campaign

Finish a campaign using only melee weapons.

With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.

Rescue Gnome Chompski from the Carnival.

Knock off the heads of 18 infected with the golf club.

Play the new Midnight Riders song on a jukebox.