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