After petting the dog at the beginning of the game, just after the first boat ride. Head to the right side and click on the seal on the temple and enter the pattern sequence (see video).
Once inside click the box on the left wall and take the gold ingots that fall out, then place them in the central left bowl at the shrine.
Exit the temple and go into the left building that the woman goes into. Inside click the cupboard on the bottom left and enter the numbers in order from left to right: 4 5 6 8
Take the half jar liquor that falls out and exit. Outside go left and use the half jar liquor on the barrel to gain diluted liquor.
Go back to the temple and place the diluted liquor on the right side bowl at the shrine, from here you will gain the achievement after a bit of dialogue.
If you need more help with this you can follow my guide below which starts at this point: