Full list of all 39 Sable's Grimoire achievements worth 1,000 gamerscore. It takes around 0-0.5 hours to unlock all of the achievements on Xbox One.
Accept Ein's offer to accelerate your education
Give life to earth and stone
Attempt to stop a violent crime (unsuccessfully)
Break free from the magical artifact binding you
Dabble in the art of teleportation
Show Rei the meaning of romance
Survive your first encounter with a dark elf
Die at the hands of a dark elf
Die of starvation
Complete Lisha's route
Learn the truth about Bartholomew
Finish reading Ein's book
Live out your days as a dragon's treasure
Share an indirect kiss with Drakan
Challenge the master of flexibility
Tutor the most hopeless students you can find
Finish training Ciel in human affairs
Complete Eth's route
Endure the advances of two demi-human girls at once
Spend a night alone with two demi-human girls
See for yourself the evils committed by man
Aid in a student's rehabilitation
Incur the wrath of a yuki-onna
Lie in order to spare Jorou's feelings
Complete Rei's route
Help Jorou to transform into a new person
Betray your friend's trust and have her committed against her will
Find love in an unexpected place
Impress your grade's valedictorian in a battle of wits
Help Drakan to find a place where she belongs
Act like a true friend to someone in need
Complete Drakan's route
Unwittingly walk down a strange path alongside dragonkind
Help one of your friends to get the help she needs - even if she doesn't want it
Whip that greenhorn pixie into shape
Let Tix's fate take its course
Resist Tix's seduction until the end
Brave the perils of a forest filled with pixies
Complete Tix's route