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