Here is the full list of all 34 CHAOS;HEAD NOAH achievements.
Acquired all achievements.
Finished the prologue.
Finished Chapter 1.
Finished Chapter 2.
Finished Chapter 3.
Finished Chapter 4.
Finished Chapter 5.
Finished Chapter 6.
Finished Chapter 7.
Finished Chapter 8.
Finished Chapter 9.
Discovered Rimi's Story.
Discovered Nanami's story.
Discovered Ayase's story.
Discovered Sena's story.
Discovered Kozue's story.
Discovered Yua's story.
Reached Rimi's ending.
Reached Nanami's ending.
Reached Ayase's ending.
Reached Sena's ending.
Reached Kozue's ending.
Reached Yua's ending.
Reached Ending A.
Reached Ending B.
Reached the final ending.
Reached All ending.
Found all event CGs.
Found all the "Whose Eyes Are Those?"
Found all positive delusions.
Found all negative delusions.
Delusion Synchro Rate 100%
Delusion Synchro Rate 0%
Made Hazuki wear glasses.