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