All Working Samurai Warriors 2 Empires Cheats - Playstation 2

Unlock Historical Scenarios
1570 (Battle of Anegawa) - Clear any regional scenarios
1582 (The Honnouji Incident) - Clear the 1560 Kawanakajima Scenario
1600 (Battle of Sekigahara) - Clear the 1582 Honnouji Scenario

Unlock Options for Empire Mode
In addition to the different historical scenarios, you can also unlock options to change the feel of the game. Time limit on gives you until 1600 and off gives you until winter of 2000. Annex options change how you can take territory from the enemy. Once unlocked, changing fief owners can be done by pressing select over the fief.

Adjust Annex Options - Unlock (recruit) 100 officers
Adjust Officer Limit - Unlock 50 Policy Cards
Adjust Time Limit - Clear Empire Mode
Change fief owner and default officers - Clear Empire Mode
Officer Death Options - Unlock 50 weapons

1000 K.O Badge
1000 K.O Badge - Defeat 1000 enemies in one battle. You also must win the battle.

Unlock 4th Weapon
This is the same principle as any other "Empires" game. Get your weaponsmith, either of the three; or all of them, up to level five and then enter any battle and kill at least 500 people.