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