The mission of Hammer Shortage is to collect 10 hammers. These hammers are spread around the world, and can also be dropped by monsters. Once you have gathered all the hammers you must go deliver them to Solman located on the southern shores for a reward. Gathering the hammers is very simple. You can buy all 10 Hammers from the Arms Dealer in the City. Scavenge for hammer spawns around the world or kill monsters and see if it is a drop.