Maintenance for the week of February 16:
• [COMPLETE] ESO Store and Account System for maintenance – February 19, 9:00AM EST (14:00 UTC) - 6:00PM EST (23:00 UTC)
This did bug for me a few weeks ago. I would buy a drink but it would not reflect in the achievement (visibly). Reloading ui fixed my issue and correctly updated the achievement visual to reflect where the drink was purchased.