Here is the full list of all 10 Girl's Lovecast - there are Prologue achievements.
Complete the side quest, "Catch the Brat."
Complete the side quest, "A Model of Justice."
Complete the side quest, "Finding Lilly."
Destroy the Overmind Core.
View the final cutscene.
Complete the side quest, "Tortured Canvas."
Complete the side quest, "Targeted."
Complete the side quest, "Sister Stalker."
Clear the darkness surrounding the school.
Beat the game.