Here is the full list of all 20 Forgetful Dictator achievements.
Answer 5 flag questions correctly
Complete a game with flag mode enabled
Answer 5 capital questions correctly
Complete a capital game
Conquer 8 countries during a single BlitzCraig
Complete the Super-Blitz gamemode
Conquer Australia and New Zealand
Complete the Right-Side-Up gamemode
Complete a continent game
Conquer the world!
Win a hardcore game
Conquer the USA
Defeat the Dino Dictator 30 times
Answer 20 trivia questions correctly
Answer 50 trivia questions correctly
Answer 100 trivia questions correctly
Complete a mission
Complete 10 missions
Fire a superweapon
Lose a game