For next expansion:
*Create a decent set (mythic-arcane) only obtainable through a questline, let's call this set "chromo set"*.
Achievement: complete chromo set's questline. Reward: 350aps. Title [Chromatic Sentinel].

*Add a tough and time-consuming side quest that CAN'T be completed or boosted via any kind of payment, once completed this quest unlocks a recipe to buy in the new expansion's token vendor*.
Achievement: upgrade "chromo set" into "polichromo set". Reward: 1000aps. Title [Polychromatic]. Banner with a multicolor gem.

*Add a decent piece/pieces of equipement (mythic-arcane) with a similar method of obtaining to planar pendant but add a side quest that grants the recipe (bound version) after having ran whatever is needed a specific amount of runs, let's call this item/items "iris crystal"*.
Achievement: craft "iris crystal". Reward: 250aps. Title [Colorful Grinder].