Left 4 Dead 2 Achievements

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

Earn a silver medal on any official survival map.

Stop the enemy team from collecting any gas cans during a Scavenge round.

Win a game of Scavenge.

Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.

Revive 10 dead Survivors with the defibrillator.

Kill a Special Infected with an exploding barrel.

Have all 3 generators running at once in "The Sacrifice" finale.

Rescue Gnome Chompski from the Carnival.

Navigate the sugar mill and reach the safe room without killing any Witches.

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

Using the M60, kill 25 infected without letting go of the trigger.

Collect three gifts dropped by Special Infected in Versus Mode.

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

As the Charger, bowl through the entire enemy team in a single charge.

Kill a Charger with a melee weapon while they are charging.

Kill a Tank with melee weapons.

Navigate the impound lot and reach the cemetery safe room without tripping any alarms.

As the Charger, grab a Survivor and carry them over 80 feet.

Honk the noses of 10 Clowns.