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