If you click the achievement on the right, you can only open the sub-achievement from the overview, and you can&;t return to the overview from the sub-achievement. Therefore, you need to open the dungeon and team option on the left (the mouse needs to point to this item, not the drop-down menu), so that the achievement list that appears on the right can be pulled down, and you can find the achievement of [Glory of Audoul Team (25 people)].