Is there a limit to the achievement progress by opening chests when trading in sets of Mysterious Conch?

Question

You can trade in three "Mysterious Conch," obtained by investigating set locations on the northern tidal flats and shore of Tatarasuna, at the little hut. So far, I have done this seven times, and each time the achievement tracker for opening chests in Inazuma progressed by one chest. Is there a limit to this?

Answer 1

I no longer gain achievement progress.

After receiving the grand prize, I no longer gain achievement progress, but I can still open one each day. I don't know whether this was due to a bugfix, or if there is a distinct quantity of chests that count towards progress.