Mystic Code list?

[Heavenly]

I am trying to get the Mystic Code Maniac achievement but currently I am at a lost for the remaining last 3
https://imgur.com/a/aCMrkI8

[✦ Miriam ✧]

Some Mystic Codes can be obtained only by reaching EX Ranks on special Missioms inside the Story/Extra Battles and some only unlockable via Bonding 1 Class.

[The Autumn Magician]

You might not have made them yet, check the "last created on" at the bottom right hand corner, see if you made the B/C class code yet.

[Heavenly]

Found my solution.Had to go back to the earlier levels and do some of the levels on Easy/Normal/Hard instead of Very Hard to get some of the lower level mystic code.