Complete the indicated level in Story mode under the Hard difficulty setting with all orange tactical bonuses done to unlock the corresponding character's fourth weapon.

Ginchiyo: Ishigaki Plains
Hanbei: Chugoku
Hanzo: Odawara
Hideyoshi: Komaki Nagakute
Ieyasu: Osaka
Ina: Numata Castle
Kai: Kasai Osaki rebellion
Kanbei: Osaka
Kanetsugu: Hasedo
Keiji: Hasedo
Kenshin: Shizugatake
Kiyomasa: Ishigaki Plains
Kunoichi: Rescue of Mitsunari
Magoichi: Hasedo
Masamune: Hasedo
Mitsuhide: Yamazaki
Mitsunari: Sekigahara
Motochika: Anegawa
Motonari: Yamazaki
Muneshige: Sekigahara
Nagamasa: Odani
Nene: Odawara
Nobunaga: Honnoji
Oichi: Lake Yogo
Sakon: Sekigahara
Shingen: Nagashino
Tadakatsu: Sekigahara
Ujiyasu: Great Kanto Defense
Yoshihiro: Sekigahara
Yukimura: Osaka

Complete the indicated level in Free mode under the Hard difficulty setting with all tactical bonuses done to unlock the corresponding character's fourth weapon. Note: This includes created characters, but not Takamaru.

Okuni: Kizugawa (Oda side)
No: Mt. Inaba Castle (Oda side)
Ranmaru: Honnoji (Oda side)
Yoshimoto: Mimase Pass (Takeda side)
Kotaro: Kasai Osaki rebellion (Toyotomi side)
Takamaru: Curiouser And Curiouser (third Takamaru-only level in Murasame Castle, under Normal difficulty)
Toshiie: Shizugatake (Hashiba side)
Katsuie: Tedorigawa (Oda side)
Yoshimoto Imagawa: Battle of Mimasetouge (Takeda side)
Created character Sword: Sekigahara (Western Army side)
Created character Spear: Osaka (Tokugawa side)
Created character Naginta: Hasedo (Date side)
Created character other weapon: Komaki Nagakute (Hashiba side)