On the initial page, you have to use each character and obtain their 3 unique items each, as well as the 4 generic items. You also have to obtain the medal which is dropped after your 50th win on survival (any difficulty) Once you have your first page full on the collection, it will open up a second page, with 15 more items. With each of the 15 fighters again, you must obtain their last unique 'rare' item, and upon doing so, you unlock all costumes, cg gallery and the DOA3 booster pack (for those that don't already have it). My thanks to the DOA boards.