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