Sunless Sea: Zubmariner Edition

The Admiralty may not be what it once was, but it still holds some sway in London. For Zee Captains, your interactions will primarilly be in the form of delivering vital information from every corner of the Underzee. In exchange you'll be given Admiralty's Favour. It doubles as a sort of reputation rating and currency to be spent on free fuel and cheaper repairs.

As far as this achievement goes, simply visit 10 different ports and collect a report to deliver back to London (but don't spend them yet!). When you have 10 Admiralty's Favor, the achievement will unlock.