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