Millennia

1. 
   Age of Heroes

   Take the timeline into the Age of Heroes.
   30%
2. 
   Age of Monuments

   Take the timeline into the Age of Monuments.
   15%
3. 
   Age of Discovery

   Take the timeline into the Age of Discovery.
   14%
4. 
   Age of Alchemy

   Take the timeline into the Age of Alchemy.
   14%
5. 
   Age of Aether

   Take the timeline into the Age of Aether.
   16%
6. 
   Age of Utopia

   Take the timeline into the Age of Utopia.
   8.6%
7. 
   Age of Ecology

   Take the timeline into the Age of Ecology.
   8.6%
8. 
   Age of Blood

   Take the timeline into the Age of Blood.
   8.4%
9. 
   Age of Plague

   Take the timeline into the Age of Plague.
   3.6%
10. 
    Age of Intolerance

    Take the timeline into the Age of Intolerance.
    12%
11. 
    Age of Heresy

    Take the timeline into the Age of Heresy.
    1.4%
12. 
    Age of Old OnesSecret

    Steam withholds the description of a secret achievement.
    0.7%
13. 
    Age of Ignorance

    Take the timeline into the Age of Ignorance.
    2.1%
14. 
    Age of Dystopia

    Take the timeline into the Age of Dystopia.
    2.7%
15. 
    Age of Visitors

    Take the timeline into the Age of Visitors.
    7.4%
16. 
    Age of Conquest

    Win a game via the Age of Conquest.
    2.9%
17. 
    Age of Harmony

    Win a game via the Age of Harmony.
    4.7%
18. 
    Age of Generals

    Win a game via the Age of Generals.
    1.6%
19. 
    Age of Departure

    Win a game via the Age of Departure.
    7.1%
20. 
    Age of Archangels

    Win a game via the Age of Archangels.
    5.3%
21. 
    Age of Transcendence

    Win a game via the Age of Transcendence.
    10%
22. 
    Out of Time

    Win a game by reaching the turn limit.
    1.2%
23. 
    Time To Die

    Win a game by being the last remaining Nation.
    5.4%
24. 
    Hard Time

    Win a game against at least 3 Master AIs.
    3.0%
25. 
    Fast Times

    Win a game by turn 200.
    5.3%
26. 
    Better Luck Next Time

    Lose a game.
    15%
27. 
    Mainline Timeline

    Reach the Age of Information with only Standard Ages in the timeline.
    3.7%
28. 
    Seeds of Faith

    Start a religion.
    53%
29. 
    O.G.

    Start a Faction.
    25%
30. 
    Dr. Livingstone, I Presume?

    Complete an Expedition.
    40%
31. 
    Customizer

    Create a Custom Nation.
    20%
32. 
    Glitch #1Secret

    Steam withholds the description of a secret achievement.
    0.8%
33. 
    Glitch #2Secret

    Steam withholds the description of a secret achievement.
    0.6%
34. 
    Glitch #3Secret

    Steam withholds the description of a secret achievement.
    0.5%
35. 
    Glitch #4Secret

    Steam withholds the description of a secret achievement.
    0.5%
36. 
    Glitch #5Secret

    Steam withholds the description of a secret achievement.
    0.4%
37. 
    Glitch #6Secret

    Steam withholds the description of a secret achievement.
    0.4%
38. 
    True EndingSecret

    Steam withholds the description of a secret achievement.
    0.4%
39. 
    Age of the Singularity

    Win a game via the Age of the Singularity
    0.7%
40. 
    Petting Zoo

    Control both a Mastodon and Smilodon simultaneously.
    8.1%
41. 
    Abundance

    Have a Farm on a Lush Wheat tile.
    5.8%
42. 
    Network Coverage

    Have 4 Tambos.
    0.5%
43. 
    Age of Atom

    Take the timeline into the Age of Atom.
    2.8%
44. 
    Age of Wasteland

    Take the timeline into the Age of Wasteland.
    0.7%
45. 
    Age of Wasteland (Victory)

    Win a game via the Age of Wasteland.
    0.3%
46. 
    Undeterred

    Launch an ICBM while in Age of Wasteland.
    0.3%
47. 
    Doomsday Machine

    Use a Retaliatory Strike.
    0.0%
48. 
    Give Peace A Chance

    Host a Peace Convention.
    0.1%
49. 
    I Am Become Death

    Complete the Manhattan Project.
    5.9%

Names, descriptions and icons are the game’s own, as Steam publishes them; the share is how many owners have unlocked each, from Steam's global figures for 49 of them.