For the most part when it comes to achievements, they will use almost everything that you have done in the game. From the simple explore, lore quests and metas. We have seen that some rewards won’t be as simple such as glory achievements where you have to kill a certain boss in a challenging way. (example they showed us was the more dots one on killing Ony for their head).
However some achievements are up in the air. We don’t know if they will use feats of strength list, pvp ones or achievements that can no longer be obtainable from years past that they removed the methods from the game over the years. If they do use those from the ones I just listed, expect decor from those to have a version on the shop.