I used to use
CritterEmote for the "For all the squirrels" type achievements. I'm not sure if the author gave up when such things went account-wide, because they never replied to any comments on the comment page.
The problem being that the achievements are no longer tracked per toon, so you don't necessarily know if you need something or not. There had been a fan update, but then the original was updated again, and then.... nothing.
OverAchiever (I think I don't have AchieveIt installed anymore) plays a sound when it wants to alert me to something, but then I have to go search around for why the sound happened. Which is useful! But Critter Emote would do the /love emote, or notify in chat if something needed to be killed.
I don't suppose anyone wants to recreate this?