Shopaholic Achievement in Mass Effect 3
Visit a store in the single-player campaign.
How to unlock Shopaholic
The first chance you get for this is when reaching the Citadel. When you go to the Huerta Memorial Hospital, the store is straight across from the counter. It's actually a computer that you can buy things from. If you press and click the , you'll see a map. Stores look like coins with an arrow going around them in a square shape. You do not have to actually purchase anything, just visit one by pressing on it.