Here is the full list of all 21 City Z achievements.
You used one of your antidotes on an infected civilian. He will loves you forever. Good job
You used tons of your antidotes on infected civilians. Even during the zombie outbreak you did not lost your humanity. Great job!
You killed your first zombie. Feels good isn't it?
You killed more than 1000 melee zombies. Good job Eradicator!
You killed more than 500 ranged zombies. Good job Eradicator!
You killed more than 100 zombie dogs. Good job Eradicator!
You killed more than 50 crusher bosses. Good job Eradicator!
You killed more than 50 spitter bosses. Good job Eradicator!
You just killed an innocent civilian. Why?
So you like to kill innocent people? It's up to you.
You used more than 100 antidotes on you. Maybe you should go for a medical check up.
You have finished the campaign! Now go and be the best in Survival mode.
The region is lost. Well done loser...
OMG you saved the region 5 times. You are a hero. Good job!
You finished with success 10 rescue missions. Well done!
You finished with success 10 extermination missions. Well done!
You finished with success 10 boss missions. Well done!
You finished with success 10 assault missions. Well done!
So you always wanted to have your own zombies horde?