Borderlands 2

1. 
   First One's FreeSecret

   Steam withholds the description of a secret achievement.
   90%
2. 
   Dragon SlayerSecret

   Steam withholds the description of a secret achievement.
   72%
3. 
   A Road Less TraveledSecret

   Steam withholds the description of a secret achievement.
   66%
4. 
   New In TownSecret

   Steam withholds the description of a secret achievement.
   64%
5. 
   An Old FlameSecret

   Steam withholds the description of a secret achievement.
   59%
6. 
   No Man Left BehindSecret

   Steam withholds the description of a secret achievement.
   52%
7. 
   Wilhelm ScreamedSecret

   Steam withholds the description of a secret achievement.
   47%
8. 
   Sky's The LimitSecret

   Steam withholds the description of a secret achievement.
   46%
9. 
   Can See My House From HereSecret

   Steam withholds the description of a secret achievement.
   44%
10. 
    Farewell, Old GirlSecret

    Steam withholds the description of a secret achievement.
    39%
11. 
    Got The Band Back TogetherSecret

    Steam withholds the description of a secret achievement.
    38%
12. 
    Identity TheftSecret

    Steam withholds the description of a secret achievement.
    36%
13. 
    An Angel's WishSecret

    Steam withholds the description of a secret achievement.
    34%
14. 
    Bombs AwaySecret

    Steam withholds the description of a secret achievement.
    32%
15. 
    Knowing Is Half The BattleSecret

    Steam withholds the description of a secret achievement.
    31%
16. 
    Cool Story, BroSecret

    Steam withholds the description of a secret achievement.
    30%
17. 
    Challenge Accepted

    Completed level 1 of all non-level-specific challenges with a single character.
    1.9%
18. 
    Goliath, Meet David

    Allowed a goliath to level up four times before killing him.
    13%
19. 
    Went Five Rounds

    Completed Round 5 of any Circle of Slaughter.
    17%
20. 
    Not Quite Dead

    Reached level 5.
    79%
21. 
    Better Than You Were

    Reached level 10.
    63%
22. 
    Always Improving

    Reached level 25.
    37%
23. 
    Capped Out... For Now

    Reached level 50.
    16%
24. 
    Arctic Explorer

    Discovered all named locations in Three Horns, Tundra Express, and Frostburn Canyon.
    5.4%
25. 
    Urban Explorer

    Discovered all named locations in Sanctuary, Opportunity, and Lynchwood.
    21%
26. 
    Highlands Explorer

    Discovered all named locations in The Highlands, Thousand Cuts, and Wildlife Exploitation Preserve.
    8.0%
27. 
    Blight Explorer

    Discovered all named locations in Eridium Blight, Arid Nexus, and Sawtooth Cauldron.
    4.8%
28. 
    World Traveler

    Discovered all named locations.
    3.8%
29. 
    Sugar Daddy

    Tipped Moxxi $10,000.
    26%
30. 
    Decked Out

    Had Purple-rated gear or better equipped in every slot.
    12%
31. 
    Sabre Rattler

    Killed 100 enemies with the Sabre turret.
    16%
32. 
    Phased and Confused

    Phaselocked 100 enemies.
    16%
33. 
    So Much Blood!

    Gunzerked continuously for 90 seconds.
    4.9%
34. 
    Cute Loot

    Killed a Chubby.
    26%
35. 
    Tribute To A Vault Hunter

    Got an item from Michael Mamaril.
    12%
36. 
    Definitely An Italian Plumber

    Killed Donkey Mong.
    8.8%
37. 
    High-Flying Hurler

    Killed a flying enemy with a thrown Tediore weapon.
    17%
38. 
    Token Gesture

    Redeemed 25 tokens.
    47%
39. 
    What does it mean?Secret

    Steam withholds the description of a secret achievement.
    10%
40. 
    Unseen Predator

    Remained in Zero's Decepti0n mode for ten seconds straight.
    6.3%
41. 
    Build Buster

    Killed a Constructor without it ever building another bot.
    47%
42. 
    Well, That Was EasySecret

    Steam withholds the description of a secret achievement.
    32%
43. 
    How Do I Look?

    Unlocked 10 customization items.
    50%
44. 
    Thresher ThrashedSecret

    Steam withholds the description of a secret achievement.
    9.9%
45. 
    Friendship Rules

    Revived someone from "Fight for Your Life!" that is on your friends list.
    47%
46. 
    Better Than Money

    Purchased 5 items from the black market.
    50%
47. 
    Up High, Down Low

    Gave Claptrap a high five.
    22%
48. 
    Bounty Hunter

    Completed 20 side missions.
    44%
49. 
    Did It All

    Completed all side missions.
    2.8%
50. 
    Feels Like The First TimeSecret

    Steam withholds the description of a secret achievement.
    18%
51. 
    Treasure Hunter

    Completed the mission "X Marks the Spot".
    13%
52. 
    Gadabout

    Discovered all named locations in Oasis and the surrounding Pirate's Booty zones.
    2.3%
53. 
    Completionist

    Completed all Pirate's Booty side missions.
    2.6%
54. 
    Explosive

    Completed the mission "Long Way To The Top".
    13%
55. 
    Motorhead

    Completed all Campaign of Carnage side missions.
    2.2%
56. 
    Obsessed

    Collected 10 pictures of Moxxi in Campaign of Carnage.
    5.0%
57. 
    Face Off

    Completed the mission "The Fall of Nakayama".
    8.7%
58. 
    Done That

    Completed all Hammerlock's Hunt side missions.
    2.1%
59. 
    Been There

    Discovered all named locations in Hammerlock's Hunt.
    2.4%
60. 
    I Totes Planned That Boss

    Slew Mister Boney Pants Guy.
    18%
61. 
    Yaaaaaay

    Introduced thyself to the White Knight.
    16%
62. 
    Shorty, You So Best

    Completed thy quest by rescuing yonder queen.
    14%
63. 
    Girl's Gotta Eat

    Fed thy noble queen 3 times during one visit to her quarters.
    7.6%
64. 
    It's Like That One Video

    Showed thine worst enemy, the abomination known as "The Darkness", who is the nerdiest of them all.
    7.2%
65. 
    They Was All "Hey That's Mine"

    Unsheathed 5 swords from Immortal Skeletaurs without leaving the area.
    15%
66. 
    Dang Girl You Ace At This Game

    Won the most challenging round in Murderlin's Temple.
    3.4%
67. 
    Hmmmmm

    Wielded the Mysterious Amulet.
    3.9%
68. 
    Keep Rollin' Rollin' Rollin'

    Demonstrated your skill, or lack thereof, at rolling the magical treasure orb of many sides.
    11%
69. 
    Make it Raaaaaid

    Vanquished the Ancient Dragons of Destruction.
    5.2%
70. 
    Anyway, Here's "Firewall"

    Activate the Backburner's firewall.
    7.4%
71. 
    Chocolate Chip Confirmed

    Allow Tiny Tina to arm the moonshot cannon.
    4.8%
72. 
    Spicy Boy

    Defeat Haderax the Invincible.
    2.3%
73. 
    Decrypted!

    Defeat the Dark Web.
    3.7%
74. 
    Painbow ConnectionSecret

    Steam withholds the description of a secret achievement.
    1.2%
75. 
    3 or Bust

    Complete the mission "Paradise Found".
    5.6%

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 75 of them.