Guild Wars 2

AP could be used as currency to buy precursors and whatnot. Just have the number shown for the player be the total AP earned, and have another label in the inventory UI (next to the laurels) to be the amount of spendable AP.

The more players play all aspects of the game should be rewarded with what they want most from the game.

Look at: https://www.guildwars2.com/en/news/new-rewards-and-the-achievements-system/
Especially the part:

Down the road, we’ll also be adding a reward structure to total achievement points, and we’ll be looking at revamping portions of existing UI to help players understand all the different kinds of content they can play and the types of rewards available. Once we have that framework in place, we’ll be able to really expand on the content accessible through the achievements system and provide you with even more new and exciting ways to play the game.

I really don’t care if they do it or not, but I think Achievement points should stay just that Achievement points, I do not think they should be used to gain Items in the game that are not pure cosmetic. Now when they release Guild halls and what not using AP’s to purchase vendors and other meaningless things I guess it ok. But no to gear lol.