The Memory Library

1. 
   First Synthesis

   Synthesize a card for the first time
   48%
2. 
   A Short Eternity

   Completed the Short Version of the Infinite Dungeon.
   2.9%
3. 
   The Endless Journey

   Completed the Full Version of the Infinite Dungeon.
   2.9%
4. 
   Master of Every Path

   Reached level 50 with every character.
   0.0%
5. 
   Versatile Explorer

   Unlocked the Explorer by clearing Chapter 4 with every other character.
   7.4%
6. 
   First Steps

   Cleared Chapter 1.
   66%
7. 
   Finding Your Footing

   Cleared Chapter 2.
   46%
8. 
   Deeper In

   Cleared Chapter 3.
   33%
9. 
   New Horizons

   Cleared Chapter 4.
   27%
10. 
    Halfway There

    Cleared Chapter 5.
    19%
11. 
    Unrelenting

    Cleared Chapter 6.
    16%
12. 
    Seasoned

    Cleared Chapter 7.
    16%
13. 
    Toward the End

    Cleared Chapter 8.
    13%
14. 
    Facing the Abyss

    Cleared Chapter 9.
    8.9%
15. 
    The Final Curtain

    Cleared the final chapter.
    7.4%

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 15 of them.