Groschen Must Flow

A cumulative spending tally - 10,000 groschen out the door at merchants over the run. You'll get most of the way there just buying gear, food and repairs, and by the late game you'll be swimming in coin. If you want to force it, blow a lump sum at a trader (buy expensive armour, or repair everything), and since it counts money spent you can even reload afterwards to get the coin back while the tally sticks. Not missable.