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