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