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