I understand the desire to have account-wide "stuff," but I think that should mainly only apply to Online Store/merchandise code purchases or Veteran Rewards or things like that.

The only in-game stuff that I would want to be account wide is character status (new/returning//mentor player) and any gear glamour/mount/minion/barding/orchestrion roll/fashion accessory/(triple triad card?) that can be purchased via the market board or via player trading.

I think most achievements, including quest progression/content unlock, titles, and non-purchasable/tradable gears/glamours, mounts, minions, bardings, orchestrion rolls, fashion accessories, and triple triad cards should remain character-bound.