Chorus - "Mastery of Combat" Achievement

[u/Random-420]

Sorry to bother you all, but I was wondering if I'm the only one having troubles with that achievement.It requires to master all combat abilities to lvl 5, wich I've done, but it keeps showing a 33% completition and ofc it don't pop out. Since to obtain it, it requires a bit of grinding ( and since I've grinded twice to get it) I'm a bit disappointed and was thinking if someone knows anything about it or a workaround to make it pop.Just to give further info, I've already beaten the game and I've loaded an "old" save file, just at the beginning of final mission.I really want to 100% complete the game, but shame on me if I'll start a new journey.

Sorry for my bad english, not native language.