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