Here is the full list of all 25 Astrologaster achievements.
Complete Simon Forman's storyline.
Complete Emma Sharpe's storyline.
Complete Humphrey Bell's storyline.
Complete Lancelot Moore's storyline.
Complete John Whitgift's storyline.
Complete Mary Payne's storyline.
Win a medical licence.
Complete the game.
Recieve eight letters of recommendation.
Complete Sybil Fortescue's storyline.
Complete Alice Blague's storyline.
Recieve seven letters of recommendation.
Complete Thomas Blague's storyline.
Complete Robert Devereux's storyline.
Recieve six letters of recommendation.
Recieve five letters of recommendation.
Recieve four letters of recommendation.
Recieve three letters of recommendation.
Complete Nicholas Mugg's storyline.
Complete Ricardo Ferraro's storyline.
Complete Avis Allen's storyline.
Complete Emilia Lanier's storyline.
Recieve two letters of recommendation.
Recieve one letter of recommendation.
(gasp!)