ScourgeBringer

1. 
   First blood

   Clear your first fight
   —
2. 
   The Gift of Blood

   Pick your first Gift of Blood
   —
3. 
   Explorer

   Fully explore a Realm
   —
4. 
   Acorn

   Fully unlock a branch of the skill tree
   —
5. 
   Oakling

   Fully unlock two branches of the skill tree
   —
6. 
   Young oak

   Fully unlock three branches of the skill tree
   —
7. 
   Strong oak

   Fully unlock four branches of the skill tree
   —
8. 
   Cucumber-free

   Make the world cucumber-free
   —
9. 
   Sold-out

   Get all items from Greed
   —
10. 
    The Entangled Ingress

    Beat a Judge of The Entangled Ingress
    —
11. 
    The Still BastionSecret

    Steam withholds the description of a secret achievement.
    —
12. 
    The Wasted PitSecret

    Steam withholds the description of a secret achievement.
    —
13. 
    Capped

    Max out your HP to 20
    —
14. 
    Bullseye

    Beat an enemy by throwing back a bullet at it with the Smash
    —
15. 
    Strike!

    Stun an enemy by throwing another enemy on it with the Smash
    —
16. 
    Floor is lava

    Clear a room with at least 3 enemies in it without touching the ground
    —
17. 
    Showtime!

    Build a x2 combo
    —
18. 
    Ultra combo

    Build a x3 combo with the Ultra Combo Altar
    —
19. 
    The way of the warrior

    Complete a Realm without getting hit
    —
20. 
    The way of the kunoichi

    Beat a Judge without getting hit
    —
21. 
    The Living WallsSecret

    Steam withholds the description of a secret achievement.
    —
22. 
    Majestic oak

    Fully unlock five branches of the skill tree
    —
23. 
    Bootloader

    Find the NEXUS computer
    —
24. 
    A quest for knowledge

    Find all logs of Garo's expedition
    —
25. 
    The colonel was wrong

    Find all logs of military missions
    —
26. 
    Path of the enlightenment

    Find all logs of the lost ones
    —
27. 
    The Old WorldSecret

    Steam withholds the description of a secret achievement.
    —
28. 
    New challenger

    Successfully finish your first challenge room
    —
29. 
    Centenary Oak

    Fully unlock six branches of the skill tree
    —
30. 
    Treasure hunter

    Find a secret room
    —
31. 
    Master explorer

    Beat the Ordeal with all rooms of every Realm explored
    —
32. 
    The Chiming Tree

    Fully unlock all branches of the skill tree
    —
33. 
    The BeyondSecret

    Steam withholds the description of a secret achievement.
    —
34. 
    The Seeker of PowerSecret

    Steam withholds the description of a secret achievement.
    —
35. 
    The strength of the oak

    Beat the Ordeal without any health bonus (nor item, nor blessing)
    —
36. 
    Refusing the gift

    Beat the Ordeal without picking any Blessing
    —
37. 
    The JudgmentSecret

    Steam withholds the description of a secret achievement.
    —
38. 
    The new VesselSecret

    Steam withholds the description of a secret achievement.
    —
39. 
    The end of the cycleSecret

    Steam withholds the description of a secret achievement.
    —
40. 
    The Truth

    Read all the steles
    —
41. 
    Embracing Chaos

    Beat the Ordeal with a score of at least 3 Chaos
    —
42. 
    Being Chaos

    Beat the Ordeal with a score of at least 5 Chaos
    —

Names, descriptions and icons are the game’s own, as Steam publishes them.