Easy Moxxis Sampler Trophy
To buy ALL 8 drinks you need a total of 80 Moonstones (they do not have to be purchased all at the same time). If you quit to the Dashbaord and reload the game after the Achievement pops you will be able to save your 80 Moonstones. The video below will show you how it is done.
We have more cheats and tips for this game here, Borderlands: The Pre-Sequel cheats
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