No missable achievements (plus 28 unknown)
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Kill 25 zombies without missing a shot.
Successfully forde a horde of zombies 3 times.
Put down an infected party member who has passed out.
Scavenge more than double the supplies you can carry.
The station wagon breaks down 4 times during the trip.
Kill 500 zombies
Find your own grave.
Don't pull the trigger
Get attacked by zombies 20 times during scavenging.
Survive all 3 boss encounters.
Make it to Safe Heaven without starting with any money or selling anything.
Fully upgrade your station wagon.
Kill all the other members of your party while they are healthy.
Someone died of dysentery.
Have $1000 on you.
Always choose to shoot your way through zombie hoardes.
Become a zombie.
Your party dead, you made it to Safe Heaven alone.
Kill "Ryan" at the start of a game.
Make it to Safe Heaven without starting with any food or buying any food.
Beat the game on hard.
Use 50 medkits
Beat the game without trading anything on the road.
Make it to Safe Haven with George Romero in your party.
Investigate 30 points of interest.
Beat the game five times.
Stop at 50 tombstones.
[Secret] sacrifices himself for the greater good.