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