Chorus

Playing with a downloaded copy from Game Pass on XBox Series X.

Before the final phase of the game I had already levelled up all my Weapon, Rite and Combat masteries through normal game play progression to level 5 apart from the dodge.

In summary for this achievement I believe you need to have all Weapon masteries maxed out to level 5.

Note: I have been having issues with unlocking all the achievements in this game, they are very slow to pop and usually require closing the game, restarting the XBox, then hitting continue once back in the game, however and in some cases (this achievement was one) waiting until the next day before it unlocked, so its a bit difficult to be certain of all the unlock criteria.

In theory you can not go back once you are in the final mission however this is not actually accurate, on game completion you are offered to go back to the save point before the final mission. Any masteries levels gained will be lost back to that save point, but if you have unlocked any achievement during the final battle where there is a lot of opportunity of finishing them off, then its "job done".