To unlock this achievement you must win 1,000 Groschen in the dice minigame. This can at first seem impossible, as most players leave after being defeated multiple times due to a lack of funds to continue. You can solve this by bidding the highest amount possible and forfeiting the game multiple times until the opponent has at least 1,000 Groschen acquired from your forfeits. You can now play the opponent multiple times until you have won your Groschen back.
Note: Tables to play the game can be found in almost all taverns throughout the realm. Players are most active between the hours of 18:00 and 22:00. Note that players tend not to spawn in outside locations if it is raining. Do not be seated at the table when you wait using the time dial.