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