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From Rampage Knights Wiki
How to beat the challengeGoblin Wares rooms. This is a side room that appears randomly in the Courtyard onwards. Some Goblin Wares rooms are identified by a sign, but others are not. To maximise the amount of items players can buy, they should try to acquire as much gold as possible. Gold can be found in Chests, on the ground after all the enemies in a room have been killed and by destroying decorations. The Pirate sword grants one gold for every enemy killed and item destroyed, the Bottomless pouch gives one gold for every new room entered and the Curse of Midas turns food into gold. Items to avoid are Goldjaw, which makes gold heal the player but prevents them from collecting it, and the Curse of Midas which turns all the gold the player is carrying, and any they come into contact with, into stone. To complete the achievement quickly, players must simply buy all the items in the shop.
Shopkeeper gives you a present (works every time)