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