Here is the full list of all 14 Isyium achievements.
PLAYED THROUGH EVERY SONG
COMPLETED ONE RUN
COMPLETED THE FIRST CODE
COMPLETED THE SECOND CODE
COMPLETED THE THIRD CODE
COMPLETED THE FOURTH CODE
COMPLETED THE FIFTH CODE
COMPLETED THE SIXTH CODE
COMPLETED THE SEVENTH CODE
COMPLETED THE EIGHTH CODE
COMPLETED CODE DE-SCRAMBLE TO CREATE ISYIUM
EIGHT ATOMIC HITS IN A ROW
SIXTEEN ATOMIC HITS IN A ROW
TWENTY FOUR ATOMIC HITS IN A ROW