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