UPDATE -
Current status = fixed and working.
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For this achievement you must find all 5 Sahha Balls in the Chult region.
Courtesy of NWO: Uncensored I want to share this achievement guide which will show you their locations as well as the locations for the scrying orbs and lion/tigers/bears.
https://blog.nwo-uncensored.com/soshenstar-river-achievement...