Here is the full list of all 15 Rosenkreuzstilette achievements.
Finish the game as Spiritia in 60 minutes or less.
Max out your reserve of Extra Lives.
Defeat the Deviled Egg without taking any damage.
Finish the game as Grolla in 60 minutes or less.
Finish the game as Grolla Seyfarth.
Run out of time while facing Zorne Zeppelin.
Add the spunky Lilli to your arsenal.
Collect all 100 coins in Schwer-Muta's domain.
Complete a stage without taking any damage.
Finish the game as Spiritia Rosenberg.
Defeat a boss with only one point of Vitality left.
Defeat Count Zeppelin.
Max out your supply of Cross Tanks.
Defeat the 8 numbered members of Rosenkreuzstilette.
Complete the Prologue stage.