Here is the full list of all 39 Hush Hush - there are Only Your Love Can Save Them achievements.
Find all 5 of Elle's Secrets
Find all 5 of Quill's Secrets
Find all 5 of Cassie's Secrets
Find all 5 of Mio's Secrets
Find all 5 of Iro's Secrets
You got the Ultimate ending! All secrets found, no Dark Karma, and you tried to save your Rival
Qpernikiss celebrates you for finishing the story with more Light Karma than Dark Karma
Thelima commends you for finishing the story with more Dark Karma than Light Karma
You heard all of Mystic's hints
You found the fastest way to the Game Over screen
Finish all of the side character dates in one playthrough
Iro died, but it was kind of funny...
Elle died, but it made no sense...
Cassie died, and it was ironic...
Quill died, which was preventable...
Mio died, which was shocking...
You saved up $100,000. Cha-ching!
Join forces with Detective Fumi to solve Subrosa's crime problem
You ate the potato chip.
Impress Dorian
Resist the urge to 'admire' Mio, despite her best efforts to tempt you
Embarrass the Gamer Galaxy superfan with cash
Make things awkward with Bonnibel and her cousin
You earned Lilianna's respect
You inspired Elle to stand up for herself. Even if "standing up" was a bit awkward at the time
You defeated Elle in the game of Marshmallows
You got your Rival to spare you your life
You helped Mio win the Prodamon Raid
You bought the fancy wine at dinner
You successfully helped Lotus flirt with Nimh
You saved Iro in Chapter 5 without her getting hurt
You boosted your Buff stat up to 50
You boosted your Suave stat up to 50
You boosted your Tech Savvy stat up to 50
You boosted your Lucky stat up to 50
You boosted your Motivation stat up to 50
Finish the game on Easy Mode
Finish the game on Normal Mode
Finish the game on Hard Mode