As someone who loves to grind achievements and show off my rewards, I like the suggestions in this thread to have more ways to show off achievements and more ways to track them.

The devs have also added new reward types in the past, such as music rolls, adventurer plates and fashion accessories. Maybe there could be another new type of reward? To give an example, I'd like collectable "auras". Kind of like titles you choose to equip, but visual. Maybe your footsteps sparkle a little when you run around, the ground around you slowly turns frosty when you stand still or your teleport animation is different and you sink into / rise from the ground when you teleport.