Me Gold! Achievement not being given, Inappropriate delay on other achievements.

When finding treasure chest after discovering treasure map from ruins/shipwreck,  it does not yield the appropriate connected achievement (Me Gold!). Treasure chest has been searched in piecewise fashion, emptied and incrementally refilled, refilled entirely and reburied. Even after the chest in question was dug up again, the achievement  failed to display. Unnecessarily long attempts to remain underwater to gain the "Sleeping with the Fishes" achievement required the player to remain underwater for several days, not merely a single day/night cycle - eventually awarded after several attempts and in game days. As many as four separate treasure chests have been interacted with, and player has yet to be credited for the initial find, despite "Ahoy!" and "Atlantis?" being credited with their subsequent finds.