This guidance includes requirements to unlock all achievements, along with key steps to solve the puzzles. NO spoiler includes.
Main Story Achievements
Open each door in chapter 6 to read comics in the room. Kai will fall asleep in the comic room, so open the next door in the next round.
Fill the previous blank with “FOLLOW TUNE” , then use “ACCEPT”, “FIGHT”, “RUN”, and “JUMP” respectively in the following blank and finish the dream. (The sequence of the four dreams is not important.)
Fan of Kai
After finishing the game, launch the game again, select any chapter and get in.