Thief

1. 
   Obsessive Compulsive

   Stole all loot and collectibles in a single chapter.
   3.6%
2. 
   Sleight of Hand

   Picked 100 pockets in a single playthrough
   4.0%
3. 
   Quickly Pick a Lucky Lock

   Picked a lock with masterful speed
   23%
4. 
   Something to Prove

   Finished the game with a custom difficulty of 700 points or more
   2.1%
5. 
   Dark Archer

   Completed 10 optional Thieving Objectives
   9.2%
6. 
   Legend in Leather

   Completed 25 optional Thieving Objectives
   2.5%
7. 
   Mint Condition

   Finished 3 consecutive chapters without taking damage
   12%
8. 
   Focus on the Tasks at Hand

   Picked a pocket and a lock using the focus ability
   5.3%
9. 
   A Moral Victory

   Finished the game without a single kill or knockout
   2.4%
10. 
    One Step Ahead

    Disarmed ten trap mechanisms
    15%
11. 
    Clear Headed

    Reached the final chapter without using the focus ability
    2.5%
12. 
    Hard Times

    Finished the game on Master difficulty
    4.0%
13. 
    Modesty Denied

    Scored an epic 5,000,000 or more in a Challenge Map
    2.0%
14. 
    Child of the Shadows

    Finished a single chapter without alerting anyone
    39%
15. 
    Hail of Glass

    Shot a bottle in mid-air with an arrow
    2.6%
16. 
    Health Hazard

    Killed or knocked out 10 people using the environment
    12%
17. 
    Priceless

    Completed a collectible set
    8.2%
18. 
    What's Yours is Mine

    Completed all collectible sets
    2.4%
19. 
    Happy Birthday

    Sweet sixteen. Snuff said.
    41%
20. 
    Hidden Agenda

    Discovered 15 secret areas
    17%
21. 
    Finders Keepers

    Discovered all secret areas
    2.0%
22. 
    Cache Dispenser

    Used 40,000 gold
    3.6%
23. 
    Working Overtime

    Completed all client jobs in The City
    7.3%
24. 
    Dastardly Deeds

    Completed all Basso Jobs in The City
    7.4%
25. 
    All That Glitters

    Stole 5 collectibles
    47%
26. 
    Old Habits Die Hard

    Found all the secret stashes in Moira
    2.8%
27. 
    Two Faced

    Uncovered Lyegrove's secret
    30%
28. 
    The Drop

    Finished the Prologue
    79%
29. 
    Lockdown

    Finished Chapter One
    69%
30. 
    Dust to Dust

    Finished Chapter Two
    48%
31. 
    Dirty Secrets

    Finished Chapter Three
    32%
32. 
    A Friend in Need

    Finished Chapter Four
    27%
33. 
    The Forsaken

    Finished Chapter Five
    22%
34. 
    A Man Apart

    Finished Chapter Six
    20%
35. 
    The Hidden City

    Finished Chapter Seven
    17%
36. 
    The Dawn's Light

    Finished Chapter Eight
    16%
37. 
    Predatory Drive

    Finished the game in 15 hours or more
    9.0%

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 37 of them.