Here is the full list of all 21 SurrounDead achievements.
Take out 50 animals.
Take out 10 zombies bosses.
Take out 100 human survivors with one character.
Traverse for 100km with one character.
Take out 500 zombies with one character.
Take out a zombie boss.
Take out a human survivor.
Break a bone from a high fall.
Traverse for 10km with one character.
Use a medical item on the player.
Play 'Survival'.
Find & drive a vehicle.
Place down a buildable.
Gain access to a secure area.
Cause the death of your player.
Play SurrounDead during Early Access release.
Take out 5000 zombies with one character.
Gain access to a hidden secure laboratory.
**REDACTED**
Take out 200 animals.
Catch a fish.