The Traitor's Keep Add-on for Fable III has 10 achievements worth 250 gamerscore.
Find all of General Turner's diaries.
Find all of Witchcraft Mary's diaries.
Find all of Professor Faraday's diaries.
Help Huxley end his Loneliness Mode.
Open all Demon Doors.
Decide the future of the Keep.
Defeat General Turner.
Defeat Witchcraft Mary.
Defeat Professor Faraday.
Survive an assassination attempt.