Here is the full list of all 18 Fading Hearts achievements.
Rewarded for being in a Log Cabin
Cause a major glitch in an ending
Cause a bank to fail
Save a fellow IT worker from having a meltdown
Expose Mystica's identity
Learn about Alex's past
Discover the truth behind the "The Player's" emails
Convince Claire to break up with her boyfriend
Confront yourself
Meet a tragic end to your life
See a hidden side of Rina's personality
Escape a calamity with only your life
Meet the mysterious Magical Girl Mystica
Be at the right time and place to avoid catastrophe
Find the heart of the forest
Engage the source of the shadows in a final showdown
Uncover the truth behind the shadows
Keep Sophia company