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