HOW TO DO IT:
1.Get A Brewing Stand (i got it at a village)
2.Get Empty Glass Bottles
3. Put the bottles in the brewing stand
4. take it out and there you have it, you got the achievement for brewing a potion without doing so.

WHAT HAPPENED TO ME:
i got my glass bottles out of my brewing stand and i just got the achievement. gotta say im pretty upset, i want to earn those achievements but i just did nothing and got it .