Speaking of Achievements, whenever you acquire something new in most other sections of the game interface a New symbol (exclamation point inside a circle) appears to notify you and direct you to the new item or information.
This does not happen for the Achievements dialog. It would be most useful if, like other items, that New symbol was displayed for new achievements so that you a) No you have a new unviewed achievement and b) you can easily find it among the numerous achievement sections.
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PC/NA