The Adventures of Elena Temple: Definitive Edition (EP)

I would recommend getting this achievement after you’ve acquired the Scroll of Completion. With this item, you’ll be able to see the parts of the map you haven’t been to.

Once you go to the other parts of the map by either going up, left, right or down, you’ll see more gold coins lying around. Make sure to shoot all pots. Then after getting all 120 Gold Coins, you can just exit the level.