VOIDFACE

1. 
   Boss rush beginner

   Clear a stage.
   87%
2. 
   Boss rush maniac

   Clear a stage on hard mode.
   62%
3. 
   Wait, that's just the intro?

   Clear all INTRO stages.
   42%
4. 
   Hunter

   Clear all INTRO stages on hard mode.
   25%
5. 
   Good times

   Clear all CLASSIC stages.
   18%
6. 
   Vicious

   Clear all CLASSIC stages on hard mode.
   6.6%
7. 
   The arbiter of chaos

   Clear all CHAOS stages.
   15%
8. 
   Deathbringer

   Clear all CHAOS stages on hard mode.
   5.4%
9. 
   Wheeee!Secret

   Steam withholds the description of a secret achievement.
   50%
10. 
    Let him cook...Secret

    Steam withholds the description of a secret achievement.
    22%
11. 
    Ritualographer

    Use 3 different spells.
    77%
12. 
    A real oneSecret

    Steam withholds the description of a secret achievement.
    12%
13. 
    Tutoring

    Clear the tutorial.
    98%
14. 
    FINAL LESSON!Secret

    Steam withholds the description of a secret achievement.
    7.3%
15. 
    Too much power!Secret

    Steam withholds the description of a secret achievement.
    7.6%
16. 
    Ritualista

    Use 7 different spells.
    46%
17. 
    Out of ammo!

    Beat a stage without shooting.
    3.3%
18. 
    Eye for an eyeSecret

    Steam withholds the description of a secret achievement.
    16%
19. 
    Blossoming titans

    Clear the FINALE.
    7.0%
20. 
    Flawlessly at high speed

    Earn a golden time on any stage.
    3.9%
21. 
    Intended experience

    Clear all campaign stages on hard mode.
    2.4%
22. 
    Self-insertSecret

    Steam withholds the description of a secret achievement.
    1.0%
23. 
    The only spell you need

    Use erase 5 times in one level.
    40%
24. 
    I'd like to return some items

    Absorb 50+ bullets at once.
    6.5%
25. 
    Incoming!

    Kill orbiter with it's own airstrike.
    3.7%
26. 
    Factory warzone

    Have 3 mechs on-screen at once.
    1.0%
27. 
    Nope nope nope

    Have 10 spider minions on-screen at once.
    2.8%
28. 
    Unmasker

    Break both of parasite's faceplates in under 16 seconds.
    3.1%
29. 
    Dentistry

    Break all of voidmouth's teeth (without laser).
    6.4%

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 29 of them.