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