Here is the full list of all 33 Cosmic Star Heroine achievements.
Gain at least 20 recruits for your ship
Complete the game
Defeat the Prime Evil
Reclaim your high score
A party member betrays you
Defeat a special bounty
Defeat a true hero
Defeat a cosmic entity
Deal over 9999 damage in a single hit
Scare rats away in Gehenna
Gain Chahn's ultimate ability
Find the ultimate ingredient
Gain your final party member
Prove your innocence
Defeat the ultimate zombie
Defeat the Crystal Wraith
Defeat the Nightmare
Escape confinement
Use Clarke's Self-Destruct ability
Chat with your party members
Commandeer your own spaceship
Use a Heroine program
Defeat the Blobmith
Win every round of Rock Paper Scissors
Win a VR Battle
Reach Lauren's apartment
Charm an enemy
Defeat Spectral Dragon
Share a soda
Defeat the lab guardian
Reach 300 Style
Win first battle in game on hardest difficulty level
Complete SkyBreaker Tower scenario