Left 4 Dead 2 achievements

Kill a Special Infected with an exploding barrel.

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

Finish a campaign using only melee weapons.

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

Collect 15 gas cans in a single Scavenge round.

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

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

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

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

Kill a Tank with melee weapons.

Prove you are stronger than Moustachio.

Revive an incapacitated teammate while a Tank is nearby.