Here is the full list of all 20 Backstage Pass achievements.
Bought every item.
Bought every article of clothing.
Got the best end in Alvin's route.
Unlocked every ending.
Got the best end in Adam's friendship and romance routes.
Ended the year with a 4.0 GPA.
Got the best end in Benito's friendship and romance routes.
Ended the year with tons of money.
Got the best end in Nicole's route.
Got the best end in Matthew's friendship and romance routes.
Got the best end in Lloyd's route.
Became an online celebrity.
Got the alone ending at least five times.
Became a producer.
Became a famous makeup artist.
Maxed out all stats.
Dropped out of college.
Got the best end in John's friendship and romance routes.
Ended the year in the same place you began.
Filled Sian's cookbook with every cupcake recipe.