Here is the full list of all 11 DANMAKAI: Red Forbidden Fruit achievements.
Clear Easy mode.
Clear Normal mode.
Clear Hard mode.
Clear Lunatic mode.
Clear Extra mode.
Achieved Eldied good ending.
Achieved Diana good ending.
Achieved Angelica good ending.
Clear 30 scenes on Challenge mode.
Clear all scenes on Challenge mode. Great!
Clear all scenes with all characters on Challenge mode. Amazing!