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