Well entering the city and allowing your ears to hear the overpoweredness of the city is completionist-tier enough I'd say. People that want to go above and beyond can actually play the content for their beautiful orange particle completionist cape of proness.
Us regular completionist's are pretty used to entering places, unlocking tracks and calling it a day.
With the first batch, the only requirement is for trim and that's the statue.
With the second one, we get the impling codex and then combination potions, catching all implings on the surface of RS and I'm assuming the recipes for the potions will be regular comp reqs.
And then there'll be a music track and after the second batch probably a task set for regular comp. (not sure when the tasks are coming but I'm assuming even after the second batch)
Then they will nerf the sound of the track and make it bad, then make you re-listen just so you understand that you can always play the track again, if you wish to.