Here is the full list of all 14 Crimson Spires achievements.
Witness Julian's true nature
Choose a partner for the second half of the game
Fully embrace the ways of the Batailles
Get the good ending on the Julian path
Get the good ending on the Liam path
Get the good ending on the Maddy path
Get the good ending on the August path
Get the bad ending on the Julian path
Get the bad ending on the Liam path
Get the bad ending on the Maddy path
Get the bad ending on the August path
Complete Julian's path without losing your humanity
Complete all four romance paths with a good ending