Here is the full list of all 10 First Snow achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Unlock the secret option, and then disable it
Browse the Guest Art Gallery
Finish the story for the first time
Meet Caprice and Millie's roommate
Go on a short but sweet road trip
Begin Act 3
Meet the leader of the campus' writing club
Begin Act 2
Begin Act 1
Get wrapped up in Caprice's enthusiasm