I thought it would be nice if when you completed an achievement that has a reward, the UI would highlight the category of that achievement to let you know that you have unclaimed rewards from that particular NPC. When I complete an achievement, I might not necessarily want to run right out to the NPC to claim the reward, and after awhile I usually forget that I even got the reward or what achievement it came from (particularly title rewards).

I've gotten a lot of achievements since they came out, but I don't know which NPCs I need to speak with in order to claim my rewards. I really don't want to go to all the NPCs just to find out if there's a reward I havn't gotten yet.