You will have to visit the "Hall of Gods" during the first mission after the prologue - "Gods and Monsters". One of the objects here is called the "Cauldron Of Circe" which is what you use to make potions.
Here are the ingredients required for the potions:
Attack potion – 6 Olympian Fig
Stamina potion – 5 Blue Mushroom
Health potion – 5 Pomegranate
Defense potion – 6 Flower Nectar
Just craft any one of these and the achievement will unlock.