Kotama and Academy Citadel

1. 
   Arrowhead Alpha

   Defeat Sailfish.
   73%
2. 
   Dreamweaver

   Defeat Klara & Stage Device.
   60%
3. 
   The Decomposer

   Defeat Bio-Regen Life Support System.
   52%
4. 
   Spatial Cruiser

   Defeat EDI & Eliane.
   45%
5. 
   Planet Pioneer

   Defeat Aegis.
   40%
6. 
   The Principal

   Defeat AI Academy Admin Network.
   35%
7. 
   The Carmel StarSecret

   Steam withholds the description of a secret achievement.
   23%
8. 
   KotamaSecret

   Steam withholds the description of a secret achievement.
   22%
9. 
   Reliable

   Enhance any weapon to its maximum level.
   40%
10. 
    Acting Disciplinary Supervisor

    Obtain all weapons.
    40%
11. 
    You Are All My

    Enhance all weapons to their maximum level.
    25%
12. 
    The Pinnacle of Excellence

    Unlock all skills for any weapon.
    36%
13. 
    Master of Weapons

    Unlock all skills for every weapon.
    23%
14. 
    Life Jade

    Collect all Life Jade Shards.
    31%
15. 
    Absolute Chronofield

    Collect all Chronopetals.
    27%
16. 
    Back to the Past

    Collect all Temporal Coils.
    29%
17. 
    Memocard Fanatic

    Collect all Memocards.
    20%
18. 
    Full Power Unleashed

    Maximize Memocard slots.
    22%
19. 
    Dangerous Goods

    Recover the first banned Film in Carmel.
    46%
20. 
    The President's Trust

    Recover all Films.
    22%
21. 
    The Candidate

    Receive the students' votes for the first time.
    81%
22. 
    DreamforgeSecret

    Steam withholds the description of a secret achievement.
    29%
23. 
    Fungal CrisisSecret

    Steam withholds the description of a secret achievement.
    30%
24. 
    The Stumbling GirlSecret

    Steam withholds the description of a secret achievement.
    31%
25. 
    Ibis's DreamSecret

    Steam withholds the description of a secret achievement.
    30%
26. 
    Platform of BeginningsSecret

    Steam withholds the description of a secret achievement.
    36%
27. 
    Consumerist Trap

    Purchase every item in Saya's shop.
    30%
28. 
    The FutureSecret

    Steam withholds the description of a secret achievement.
    25%
29. 
    Passage Permit

    Offer the four administrators' Keepsakes to activate the elevator to the Tower.
    39%
30. 
    Return to RealitySecret

    Steam withholds the description of a secret achievement.
    25%
31. 
    One More BeginningSecret

    Steam withholds the description of a secret achievement.
    20%
32. 
    Farewell to the Solar SystemSecret

    Steam withholds the description of a secret achievement.
    21%
33. 
    Return to EarthSecret

    Steam withholds the description of a secret achievement.
    22%
34. 
    Save the CatSecret

    Steam withholds the description of a secret achievement.
    25%
35. 
    StargazerSecret

    Steam withholds the description of a secret achievement.
    24%
36. 
    Honor Student

    Finish the game on Challenge difficulty.
    11%
37. 
    Humanoid Auto-Guide

    Achieve 100% map exploration.
    17%
38. 
    The People's Choice

    Achieve 100% of the votes.
    19%
39. 
    Kotama and Academy Citadel

    Unlock all achievements.
    7.8%
40. 
    Hall of FameSecret

    Steam withholds the description of a secret achievement.
    32%

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 40 of them.