Don't pull the trigger.

Make it to Safe Haven with someone named Romero in your party.

Fully upgrade your station wagon.

Kill 25 zombies without missing a shot.

Someone died of dysentery.

Successfully forde a horde of zombies 3 times.

Have $1000 on you.

Find your own grave.

Become a zombie.

Kill 500 zombies.

Put down an infected party member who has passed out.

Beat the game five times.

Beat the game on Difficult