Here is the full list of all 15 Libra of the Vampire Princess achievements.
Played game 10 hours
Selected Mari route
Played game 1 hour
Shut down game first time
Watched opening movie
Started game first time
Played game 30 hours
Selected Calen route
Selected Aoi & Lycoris route
Selected Aoi route
Selected Lycoris route
Cleared Mari route
Cleared Calen route
Cleared Aoi route
Cleared Lycoris route