Here is the full list of all 16 Sable's Grimoire: A Dragon's Treasure achievements.
Complete the bad end
Bid farewell to your other half
Complete the true end
Complete the good end
Return from the brink of death
Complete the neutral end
Resist the call of the astral plane
Beat Drakan in a game of predator and prey
Go hunting with Drakan
Meet Drakan's father
Walk among the living as the vessel of something inhuman
Enjoy a picnic in the desert with Drakan
Check in on Drakan during class from afar
Awaken to a new kind of power
Visit the astral plane
Enjoy a moonlight stroll with Drakan