Punch a Hunter as he is pouncing.

Rescue a Survivor from a Smoker's tongue before he takes damage.

Kill a Witch with a single headshot.

No Survivors take damage after contacting the rescue vehicle.

You or another Survivor take no damage after being vomited on by a Boomer.

Protect any Survivor from an attacking Infected 50 times.

Survive an entire campaign using only pistols.

Heal 25 Survivors with a first aid kit.

Give pain pills to 10 Survivors.

Revive 50 incapacitated Survivors.

Rescue a Survivor trapped in a closet.

Shove a Hunter off of a pinned and helpless Survivor.

Kill a Smoker who has grabbed you with his tongue.

Kill 10 Smokers as they are pulling helpless Survivors.

Set 101 Infected on fire.

Sneak past all Witches in a campaign without disturbing one.

Single-handedly kill a Tank.

Kill a Tank without it dealing any damage to a Survivor.

Play an entire campaign with no Survivors taking friendly fire damage.

Beat a campaign with all 4 Survivors.

Finish a campaign without ever using a first aid kit on yourself.

Kill a Witch without any Survivor taking damage from her.

Kill 1000 Infected with a mounted machine gun.

Blow up 20 Infected in a single explosion.