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