Foundation

1. 
   Your First Church

   Build a Rustic Church
   68%
2. 
   Expansion

   Purchase your first Territory
   77%
3. 
   Bathing in Gold

   Amass 10,000 Coins
   8.3%
4. 
   A Growing Village!

   Have a population of 100 or more
   48%
5. 
   A Thriving City!

   Have a population of 500 or more
   6.2%
6. 
   Ye Noble Black Prince!Secret

   Steam withholds the description of a secret achievement.
   7.6%
7. 
   Sound the Trumpets!

   Complete a Military Mission
   26%
8. 
   A Legend is Born

   Promote a Soldier to Knight
   11%
9. 
   A Fief Too Far

   Own 30 Territories
   3.8%
10. 
    Feudal Overlord

    Own at least 30 Territories (Challenge rules or harder)
    0.5%
11. 
    Civitas Maxima

    Have a population of 500 or more (Challenge rules or harder)
    0.5%
12. 
    Hammer Time!

    Produce Tools
    25%
13. 
    Room for One More?

    Build a Workplace Extension
    34%
14. 
    Spices of Life

    Start a Trade Route
    41%
15. 
    Hanseatic Spirit

    Upgrade all Trade Routes at least once
    2.5%
16. 
    Merchant Prince

    Upgrade a Trade Route to Level 5
    3.3%
17. 
    King Midas

    Earn 15,000 Coins within 30 days
    0.3%
18. 
    Just this once... I promise!

    Earn Coins from the Levy Mandate
    32%
19. 
    Calling a Ban

    Enact an Edict
    26%
20. 
    Serf and Turf

    Tax a Villager
    34%
21. 
    The Gabelle Gambit

    Enact all seven Taxes
    0.8%
22. 
    The Exchequer's Haul

    Collect 5,000 Tax Coins in a single month
    1.5%
23. 
    The Boar's Head Feast

    Produce a Tavern Meal
    4.9%
24. 
    Happy as a Lark

    Have a Villager with 150% Happiness
    19%
25. 
    The Big Cheese of Cheddar Palace

    Build a Great Hall worth 100 Labour Splendour
    2.8%
26. 
    Teloneum

    Enact the Merchandise Taxes Privilege (Challenge rules or harder)
    0.5%
27. 
    One of the People

    Complete the Aspiration: A Prestigious Burg
    1.1%
28. 
    The Burgomaster

    Complete the Aspiration: A Prestigious Burg (Challenge rules or harder)
    0.4%
29. 
    Marching On!

    Form a Company
    16%
30. 
    Veni, Vidi, Vici

    Complete a Military Mission of Grade 3
    1.3%
31. 
    Montjoie! Saint Denis!

    Deploy a Battalion to a Military Campaign
    1.0%
32. 
    Against All Odds

    Complete a Military Campaign (Challenge rules or harder)
    0.3%
33. 
    Honi soit qui mal y pense!

    Successfully host a Company of Royal Knights
    1.6%
34. 
    Fit for a King

    Build Private Quarters worth 100 Kingdom Splendour
    0.7%
35. 
    Salt Fish and Pottage

    Stock 400 War Rations
    0.8%
36. 
    Centuria

    Have an army of 100 Combatants
    0.5%
37. 
    Iron and Oak

    Complete the Aspiration: A Mighty Stronghold
    0.5%
38. 
    Steel and Stone

    Complete the Aspiration: A Mighty Stronghold (Challenge rules or harder)
    0.3%
39. 
    The Way of Saint James

    Host a Pilgrim
    7.5%
40. 
    Ora et Labora

    Produce a Monastic Meal
    7.7%
41. 
    Via Commercii, Via Dei

    Trade 500 resources with Kinstone Abbey over 30 days
    6.3%
42. 
    Divine Architecture

    Build an Abbatial Church worth 100 Clergy Splendour
    1.3%
43. 
    First Growth

    Enact the Seal of Prestige Privilege (Challenge rules or harder)
    0.2%
44. 
    Prior of Plenty

    Complete the Aspiration: A Prosperous Priory
    0.9%
45. 
    Abbey of Abundance

    Complete the Aspiration: A Prosperous Priory (Challenge rules or harder)
    0.4%

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 45 of them.