Unlock the two-handed sword:
     Finish the game as France to get Durandal.
(Edge: 99, Point: 99, Blunt: 99, Magic: 99, everything else 0). 

Unlock single handed sword:
     Finish the game as England to unlock the Excalibur.
(Edge: 99, Point:99, everything else 0). 

Shop discount:
     Find  and  pick  up  all  12  Gems to buy anything in the shop on
discount price.

Bonus Super weapons:
     Reach 100% Growth on Swords, Spears, and Bows.
Note: To complete Spears you must defeat units from all the Books.

     Finish  the  entire  game  to  unlock  weapons  from  the Dynasty
Warriors  and Samurai Warriors. You can purchase the following weapons
at the store once completed the game:

Zhao Yun's spear
Yukimura Sanada's spear
Xing Cai's pike 
Xiahou Yuan's club 
Nobunaga's sword 
Magoichi Saika's gun 
Guan Yu's halberd