Here is the full list of all 14 Corona Borealis achievements.
Alone Ending
Noah's Epilogue
Noah's Romance Ending
Noah's Catering Event
Lacey's Epilogue
Lacey's Ending (Either)
Lacey's Romance Ending
Lacey's 4th of July
Noah's 4th of July
Logan's Friendship Ending
Logan's Romance Ending
Basil's Friendship Ending
Basil's 4th of July
Basil's Scene 3