Here is the full list of all 42 Rebuild 3: Gangs of Deadsville achievements.
Kill 100,000 zombies cumulatively
Complete the final scenario city
Complete the Return to New York questline
Discover the true origin of the disease
Equip a Rocket Launcher
Finish any city on Impossible difficulty
Use 50 bath salts in one game
Equip every survivor with a gun
Finish any city on Hard difficulty
Get any survivor to defense level 20 (includes equipment)
Eat enough people to be considered evil cannibals
Repair an airplane and fly away
Fully infect the Dahlias with your cultists
Have 50% of survivors become cultists
Complete the Pig Farmer questline
Have 100 survivors at once
Kill 10,000 zombies cumulatively
Equip 10 animals
Have 365 food at once
Complete every research project
Light off Fireworks
Have 5 hospitals, 10 medkits, and 100 medicine at once
Generate a surplus of 50 food per day from farms
Complete the Gangs of Deadsville questline
Declare peace with a faction
Find 100 items while scavenging cumulatively
Destroy every faction on the map
Destroy any faction
Produce 100 items in the workshop cumulatively
Have a survivor with 10 in every skill
Become Gustav's friend and get his special deals
Reclaim the entire city
Be allies with every faction in the city
Kill 1000 zombies cumulatively
Become allies with any faction
Fix a Power Plant
Finish any city on any difficulty
Finish any city by day 50
Complete scenario city 1
Build a City Hall
Get any survivor to level 10 in some skill
Kill 100 zombies cumulatively