This glitch allows you to buy things in the store without losing any money. Start any stage in Story Mode, create an Interim Save, choose Quit, and then choose the Continue option. You should exit the map using Triangle to go back to the previous screen. Select Free Mode to void your Interim Save and select a different character from the one you used for Story Mode. Buy whatever you want from the shop, exit the shop, and soft reset (hold Start+Select at the same time) on the stage select screen. You will have all your gold back and keep the items you bought!
Hattori Hanzou
Beat Musou Mode with Fuuma Kotarou, or Have Sengoku Musou 1 save on memory card before starting the game.
Honda Tadakatsu
Beat Musou Mode with Tokugawa Ieyasu, or Have Sengoku Musou 1 Moushouden save on memory card before starting the game.
Inahime
Beat Musou Mode with Honda Tadakatsu.
Maeda Keiji
Beat Musou Mode with Naoe Kanetsugu.
Miyamoto Musashi
Unlock all other characters, not including Okuni and Ranmaru.
Mori Ranmaru
Complete Mori Ranmaru's request on 1F, Akechi Mitsuhide's request on 11F, Akechi Mitsuhide's request on 21F, and Mori Ranmaru's second request on 31F.
Naoe Kanetsugu
Beat Musou Mode with Sanada Yukimura.
Nene
Beat Musou Mode with Toyotomi Hideyoshi.
Nouhime
Beat Musou Mode with Oda Nobunaga.
Oda Nobunaga
Beat Musou Mode with Saika Magoichi.
Okuni
Clear Sugoroku Mode.
Saika Magoichi
Beat Musou Mode with Akechi Mitsuhide.
Shima Sakon
Beat Musou Mode with Ishida Mitsunari.
Shimazu Yoshihiro
Beat Musou Mode with Tachibana Ginchiyo.
Takeda Shingen
Beat Musou Mode with Uesugi Kenshin.
Toyotomi Hideyoshi
Beat Musou Mode with Ishida Mitsunari.
Uesugi Kenshin
Clear Musou Mode with Naoe Kanetsugu, or Have Sengoku Musou 1 save on memory card before starting the game.
Unlocking Gaiden Stages
Normally, the requirement to unlock someone's Gaiden is to clear his/her Musou Mode. However for some characters, you need to clear another character's Musou Mode (Sometimes including Gaiden) as well to unlock them.
Effect - Task
Ishida Mitsunari's Gaiden - Beat Naoe Kanetsugu's Musou Mode as well
Oichi's Gaiden - Beat Nouhime's Musou Mode including Gaiden as well
Saika Magoichi's Gaiden - Beat Date Masamune's Musou Mode as well
Shimazu Yoshihiro's Gaiden - Beat Sanada Yukimura's Musou Mode including Gaiden as well
Uesugi Kenshin's Gaiden - Beat Takeda Shingen's Musou Mode including Gaiden as well
Unlocking Hell Difficulty
Beat Musou Mode with Oda Nobunaga, Toyotomi Hideyoshi and Tokugawa Ieyasu.