Here is the full list of all 10 Mythos Ever After: A Cthulhu Dating Sim RX achievements.
Made it through the final day.
Strolled the Exhibit Hall.
Went to a panel.
Waited in line for Hall H.
Went to the Carnival.
Bought a highly sought after figurine.
Strolled the Gaslamp Quarter.
Waited in line for Hall H (the entire convention).
Went to the carnival with Penny and Jonny Handsome.
Spoil a book's ending.