Here is the full list of all 15 Reality's Reverse Side achievements.
Harpy's Servant
The true ending
chapter 12 complete
chapter 11 complete
chapter 10 complete
chapter 9 complete
chapter 8 complete
chapter 7 complete
chapter 6 complete
Hello love, goodbye mind
chapter 5 complete
chapter 4 complete
chapter 3 complete
chapter 2 complete
chapter 1 complete