Here is the full list of all 28 A Rose in the Twilight achievements.
Defeat Viola.
Clear Path to Abyss.
Clear Path to Abyss 1 without touching any mushrooms.
Throw Rose 100 times.
Defeat Blanc.
Die 100 times.
Clear Clock Tower.
Rescue Rose after she is taken.
Clear Library.
Obtain 10 Blood Memories.
Clear Courtyard.
Clear Armory.
Die 30 times.
Obtain 5 Blood Memories.
Die 10 times.
Giant kills Rose by throwing her.
Clear Dungeon.
Complete Time Attack within 1:20:00.
Obtain all Blood Memories.
Obtain all the collections.
Complete Time Attack within 1:50:00.
Complete Time Attack for Clock Tower Upper Level within 1:50.
Giant jumps off from the highest point in the castle.
Watch the moon from somewhere in the castle.
Clear Time Attack within 2:40:00.
Clear Time Attack for Path to Abyss 2 within 2:10.
Watch the last moments of a beast.
Perform a nice shot with Rose at Courtyard 4.