Mixtape brings players on a retro ride to the 90s that takes you back to your high school days. The memories of skipping class, hanging out with friends, and living free are all on display. One of the most relatable moments is when the main characters go into the gas station to get slushies, and you’re tasked with customizing the icy drink however you want and creating the perfect mix.

However, there is a secret blend (The Ultimate Slushy) that, if done, can net you the “Grunge Metal Alchemist” achievement. So what is the mix, and where can you find it? We have the answer below.

How to Get the Grunge Metal Alchemist Achievement in Mixtape

To get the achievement, you’ll need to fill a slushy at the gas station with four specific flavors. The sequence is part of flashbacks, where Rockford and Slater get slushies while Cassandra attempts to get liquor. There are eight flavors to choose from, and you can fill it however you want. There’s no specific one you have to get, as all choices are good. However, only one combo will net you an achievement.

Interestingly enough, the answer to getting the recipe for the so-called Ultimate Slushy is found after the slushy chapter. You’ll find it in Slater’s House, which happens after Cassandra’s fallout. Go to his vision board behind his computer and move down. There, you’ll find his recipe for the Ultimate Slushy:

Blue Crush
Bubblegum
Orange
Lime

Luckily, you can go back to various chapters, so return to the Gas Station Slushy chapter and fill one of the characters’ cups with Blue Crush, Bubblegum, Orange, and Lime. Doing s will earn you the “Grunge Metal Alchemist” achievement (and a colorful, refreshing beverage).

Mixtape is available now on PlayStation 5, Xbox Series X|S, Nintendo Switch 2, and PC.