Here is the full list of all 50 Citizens of Earth achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Get all citizens to Lv 30.
Receive 10,000 damage in combat.
Earn $100,000 in the Casino.
Complete all Photography quests.
Use 150 items.
Complete all Extermination quests.
Use 75 items.
Recruit all 40 citizens.
Enroll 9 citizens simultaneously in School.
Spend $10,000.
Defeat the Secretary Supreme.
Defeat the Alien Commander.
Defeat the Mishmasher.
Defeat Honcho Villa.
Complete all Wanted Poster quests.
Defeat Agent D.O.O.M.
Defeat DJ Voodoo.
Ambush 10 enemies in a row.
Defeat 1,000 enemies.
Defeat Colonel Cookie.
Receive 2,500 damage in combat.
Defeat the Hippie Guru.
Collect 300 items.
Recruit 25 citizens.
Find 100 treasures.
Use 25 items.
Defeat the Puppet President.
Deal 10,000 damage in combat.
Earn $10,000.
Defeat 250 enemies.
Collect 100 items.
Spend $3,000.
Get one citizen to Lv 20.
Get one citizen to Talent Lv 3.
Find 45 treasures.
Discover 30 locations.
Spend $1,000.
Discover 20 locations.
Receive 500 damage in combat.
Defeat Mr. Mocha.
Earn $3,000.
Deal 2,500 damage in combat.
Find 15 treasures.
Collect 30 items.
Defeat 50 enemies.
Earn $1,000.
Deal 500 damage in combat.
Recruit 5 citizens.
Discover 10 locations.
Defeat the Opposition Leader.