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