Become besties with Cobol.
Clear Chapter 3, "Inspector Fortran: Case Closed"
Clear Chapter 9, "Onward, to Our Dreams!"
Use every type of sword.
Purchase all types of merch from the Plushie Emporium.
Clear Chapter 2, "Enter the Prettyboy Prince"
Collect all pieces of furniture.
Clear Chapter 1, "The Prince and the Part-Timer"
Use every type of recovery item.
Become besties with Otterman.
Become besties with 18.
Complete the MonDex.
Become besties with everyone at Heroland.
Purchase all types of merch from the Blacksmith's.
Use every type of comic.
Become besties with Chip.
Clear Chapter 4, "Quest Status: It's Complicated"
Become besties with Python.
Become besties with Julia.
Use every type of capsule.
Clear Chapter 5, "False Friends"
Use every type of hammer.
Become besties with Philip.
Become besties with Mana.
Become besties with Kotori.
Become besties with Linda.
Become besties with Logo.
Become besties with Chocola.
Clear Chapter 8, "Throw Wide the Gates!"
Clear Chapter 6, "Of Manga and Monarchs"
Become besties with Jason.
Become besties with Apple.
Become besties with Oak.
Become besties with Cherry.
...But I worked until the end, hooray!
Become besties with Fortran.
Clear Chapter 7, "The Frozen Paths We Walk"
Collect all plushies.
Become besties with Vhoebe.
Use every type of tablet.
Purchase all types of merch from the Item Shop.
Use every type of staff.
Become besties with Delphi.
Become besties with Mel.
Become besties with Miranda.
Collect all replicas.
Become besties with Cee.
Become besties with Leda.