http://www.cheatcc.com/xbox360/warriorsorochi3cheatscodes.html

Rare items
Successfully complete the indicated task on the Hard or higher difficulty to unlock the corresponding item:

Bear Saddle: In Chapter 3: "Battle of Yamazaki" with Zhang He, get 1,000 K.O.s.
Datto Kyahan: In Chapter 3: "Battle of Yohei Seki" with Na Zha or Diao Chan, get 1,000 K.O.s.
Demon Mask: In Chapter 2: "Battle of Nanzhong" with Xiahou Ba, get 1,500 K.O.s. This item enables attacks from behind to be blocked.
Eight Hand Mirror (Yata Mirror): In Chapter 2: "Battle of Hasedo" with Kunoichi, get 2,000 K.O.s. This item allows you to occasionally repel enemy projectile attacks when mounted.
Elephant Saddle: In Chapter 3: "Battle of Hu Lao Gate" with Achilles, get 1,500 K.O.s.
Gauntlets Of Malice: In Chapter 2: "Battle of Xuchang" with Hanzo Hattori, Guan Yu, or Sanzang, get 1,000 K.O.s. This item refills the Musou gauge when executing a counterattack.
Gauntlets Of Vitality: In Chapter 2: "Battle of Mt. Dingjun" with Gyuki, No, or Zhao Yun, get 1,500 K.O.s. This item refills your life gauge when executing a counterattack.
Gold Gauntlets: In Chapter 2: "Battle of Kyushu" with Sun Shangxiang, get 1.500 K.O.s. This item prevents you from being knocked over when blocking.
Heavenly Robe: In Chapter 1: "Battle of Shou Chun" with Zhang Liao, get 1,000 K.O.s.
Iron Armor : In Chapter 3: "Battle of Tong Gate" with Liu Bei, Motonari Mori, or Susano'o, get 1,000 K.O.s. This item doubles defense temporarily when your life gauge becomes red.
Iron Gauntlets (Ironclad Tekko): In Chapter 1: "Battle of Nagashino" with Cao Cao, Deng Ai, Nu Wa, Oichi, Toshiie Maeda, or Zhou Tai, get 1,000 K.O.s. This item makes enemy attacks ineffective when using a charge attack.
Kattan Magatama: In Chapter 1: "Battle of Dong Kou" with Sun Wukong, get 1,500 K.O.s.
Kongo Tekko: In Chapter 2: "Battle of Kyushu" with Sun Shang Xiang, get 1,500 K.O.s.
Matsukaze Saddle: In Chapter 3: "Battle Of Honnoji" with Ayane, Mitsunari Ishida, or Musashi Miyamoto, get 1,500 K.O.s.
Musou Armor: In Chapter 1: "Battle Of Odawara Castle" with Wang Yuanji, get 1,500 K.O.s. This item prevents enemy projectile attacks from knocking you back.
Musou Kote: In Chapter 2: "Battle of Xuchang" with Sanzo Hoshi, get 1,000 K.O.s.
Musou Magatama: In Chapter 1: "Battle of Dongkou" with Lu Meng, Mitsuhide Akechi, Nene, Sima Shi, Sima Yi, or Sun Wukong, get 1,500 K.O.s. This item causes special attacks to occasionally not use Musou.
Pleiades Belt: In Chapter 3: "Battle of Changban" with Bao Sanniang, Ieyasu Tokugawa, Ryu Hayabusa, or Xiaoqiao, get 1,000 K.O.s. This item increases the chance of obtaining high quality weapons.
Prayer Beads: In Chapter 1: "Battle of Yi Ling" with Cao Pi, Da Ji, Ginchiyo Tachibana, Jiang Wei, Keiji Maeda, or Xiahou Ba, get 2,000 K.O.s. This item automatically triggers support attacks when you dive.
Rabbitskin Leggings: In Chapter 3: "Battle of Yangping Gate" with Aya, Diaochan, Nezha, or Tadakatsu Honda, get 1,000 K.O.s. This item doubles speed temporarily when your life gauge becomes red.
Raiment Of Unrest: In Chapter 1: "Battle of Shouchun" with Fu Xi, Huang Gai, Kenshin Uesugi, Kotaro Fuma, Sima Zhao, or Zhang Liao, get 1,000 K.O.s. This item makes you temporarily invincible following a sidestep.
Red Hare Saddle: In Chapter 3: "Battle of Fancheng" with Xu Huang, Wang Yi, or Jeanne d'Arc, get 1,500 K.O.s.
Seven Star Band: In Chapter 3: "Battle of Nagasaka" with Xiao Qiao, Ryu Hayabusa, or Bao Sanniang, get 1,000 K.O.s.
Spirit Armor (Shadow Armor): In Chapter 1: "Battle of Ueda Castle" with Dian Wei, Jia Xu, Kanetsugu Naoe, Nobunaga Oda, or Taishi Ci, get 1,500 K.O.s. This item causes spirit charges to occasionally not use Musou.
Sun Tzu's Art Of War: In Chapter 3: "Battle of Shizugatake" with Ina, Lu Bu, Masanori Fukushima, Shuten Doji, or Zhenji, get 1,500 K.O.s. This item extends the effective time of ability-increasing items.
Tough Armor: In Chapter 3: "Battle of Tong Gate" with Mori Motonari, get 1,000 K.O.s.
Tome Of Medicine (Art Of Medicine): In Chapter 2: "Battle of Sekigahara" with Benkei, Ranmaru Mori, or Zhang Fei, get 1,000 K.O.s. This item doubles the effects of recovery items.
True Vision (Art Of Explosives): In Chapter 2: "Battle of Luoyang" with Dong Zhuo, Hideyoshi Toyotomi, or Zhuge Liang, get 1,000 K.O.s. This item doubles attacks temporarily when your life gauge becomes red.
Vampire Kote: In Chapter 2: "Battle of Mount Ding Jun" with Nohime, get 1,500 K.O.s.
Vestment Of Voidance (Balancing Kimono): In Chapter 2: "Battle of Anegawa" with Dodomeki, Guo Huai, Huang Zhong, or Masamune Date, get 2,000 K.O.s. This item nullifies the attributes of enemy attacks.
Yasha Mask: In Chapter 2: "Battle of Nan Zhong" with Xiahou Ba, get 1,500 K.O.s.

Seven Star Band: In Chapter 3: "Battle of Nagasaka" with Xiao Qiao, Ryu Hayabusa, or Bao Sanniang, get 1,000 K.O.s IL Y A ERREURE CAR JE NE SAIT PAS SI C4EST LA BATAILLE DE CHANG OU PAS CAR J4AI JOUER AVEC XIAO QIAO ET CA PAS MARCHE A 1000 KO ALORS JE VAI RESSAYER ;; et puis comme vou voyez le jeux est anglais et ce site a mis certain objet qui etait mal transcrit en traduction ,, comme art of medecine qui est tome of medecine voila donc pas facil de s'y retrouver

en faite l'objet sevent star bant et en faite l'objet pleiad belt ok
ce sont les noms japonais, qui sont différents des noms anglais.

En fait, c'est Pleiades Belt, Battle of Changban.

Raiment of Unrest (Heavenly Robe)
Chapter 1 : Battle of Shouchun, Zhang Liao, 1000 KOs

Red Hare Saddle
Chapter 3: Battle of Fan Castle, Xu Huang, Wang Yi or Joan of Arc, 15000 Kos

Pleiades Belt (seven star band)
Chapter 3: Battle of Changban, Xiao Qiao, Ryu Hayabusa or Bao Sanniang, 1000 KOs

True Vision (art of Explosives)
Chapter 2: Battle of Luoyang, Dong Zhuo, 1000 Kos

Iron Gauntlets (ironclad Tekko)
Chapter 1 : Battle of Nagashino, Zhou Tai, 1000 KOs