Talk to The Fixer in the yard, he will ask you to help him get something for Flossy. Follow the quest to cell A-309, and interact with the Teddy (the plush fox toy) there, you will find a note telling you to do the laundry, but to take a shower first.
The laundry is on the first floor of Cell Block A, to the right of the showers, and has a level 1 door lock. If you go to the showers first, look in the janitor cart and you will find another fox toy with a note that says 6014 - this is the door code for the laundry.
You then have two options:
- Use the altered biocell yourself at any time (while it is in your inventory) to gain 5 praxis points and unlock your augmentations and get the achievement.
- Talk to Flossy and promise to give the biocell to his friend Red Shoes in B-Block in exchange for a key card (you can also get this key card by telling Flossy that you refused the pills). The player must navigate to B-Block and speak to Red Shoes in order to give him the altered biocell. Doing so awards the achievement.