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Note: This game is also titled Sengoku Musou 2: Empires.
Successfully complete any regional scenario to unlock the 1570: Battle of Anegawa scenario.
Successfully complete the 1560: Kawanakajima scenario to unlock the 1582: The Honnouji Incident scenario.
Successfully complete the 1582: The Honnouji Incident scenario to unlock the 1600: Battle of Sekigahara scenario.
Use the smith to upgrade your character's weapon to level 4. Then, successfully complete any battle with 500 K.O.s. At the end of the battle, you will receive that character's fourth weapon.
Unlock all fourth weapons for each type of weapon and the 1,000 KOs medals for all characters to unlock all image galleries and scenes.
Successfully complete the indicated task to unlock the corresponding option, which can be toggled under "Game Settings" before a battle: