Image: Rebel Wolves / Bandai NamcoOfficial screenshot from Rebel Wolves / Bandai Namco.
Selfish is a hidden achievement for selling fish to a fishmonger, and it is one of the rarest in the game. It only takes a minute, but the vendor disappears late in the game.
1. Go to Svartrau during the day. 2. Find the food vendor fishmonger in the northwest market. 3. Buy a Dried Fish from her. 4. Sell it straight back. The trophy pops on the sale.
Do this as soon as you reach Svartrau. At Infamy 9 the fishmonger is no longer there.