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