Here is the full list of all 28 Organ Trail: Director's Cut achievements.
Don't pull the trigger
Fully upgrade your station wagon.
Beat the game on hard.
Make it to Safe Haven with George Romero in your party.
Make it to Safe Heaven without starting with any food or buying any food.
Kill "Ryan" at the start of a game.
Always choose to shoot your way through zombie hoardes.
Your party dead, you made it to Safe Heaven alone.
Kill 25 zombies without missing a shot.
Make it to Safe Heaven without starting with any money or selling anything.
Kill 500 zombies
Get attacked by zombies 20 times during scavenging.
Successfully forde a horde of zombies 3 times.
Scavenge more than double the supplies you can carry.
Survive all 3 boss encounters.
Put down an infected party member who has passed out.
Stop at 50 tombstones.
The station wagon breaks down 4 times during the trip.
[Secret] sacrifices himself for the greater good.
Investigate 30 points of interest.
Use 50 medkits
Someone died of dysentery.
Have $1000 on you.
Find your own grave.
Beat the game without trading anything on the road.
Become a zombie.
Beat the game five times.
Kill all the other members of your party while they are healthy.