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