Here is the full list of all 25 Astrologaster (Windows) achievements worth 1,000 gamerscore.
Completed the game.
Completed Simon Forman's storyline.
Completed John Whitgift's storyline.
Completed Mary Payne's storyline.
Completed Humphrey Bell's storyline.
Completed Emma Sharpe's storyline.
Completed Lancelot Moore's storyline.
Completed Sybil Fortescue's storyline.
Completed Alice Blague's storyline.
Completed Thomas Blague's storyline.
Completed Robert Devereux's storyline.
Recieved eight letters of recommendation.
Won a medical licence.
Recieved seven letters of recommendation.
Recieved six letters of recommendation.
Completed Nicholas Mugg's storyline.
Completed Ricardo Ferraro's storyline.
Completed Avis Allen's storyline.
Recieved five letters of recommendation.
Completed Emilia Lanier's storyline.
Recieved four letters of recommendation.
Recieved three letters of recommendation.
Recieved two letters of recommendation.
Recieved one letter of recommendation.
Coitus post consultatio