I use to able to click on an earned achievement up until a few days ago, and it would say how it was earnt. Not anymore.
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Your browser/os information:
Mozilla/5.0 (Linux; Android 6.0.1; SM-G930F Build/MMB29K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.91 Mobile Safari/537.36 (this will help us make sense of your bug report)