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