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