Unlock the following Scenarios by beating the corresponding Scenarios:
Dong Zhou In Luo Yang scenario - Beat The Yellow Turban Rebellion scenario.
A Divided Land scenario - Beat the Dong Zhou in Luo Yang scenario.
Battle Of Guan Du scenario - Beat the A Divided Land scenario.
Flames Over Chi Bi scenario - Beat the Battle Of Guan Du scenario.
Unlockable options:
To unlock the "Executions/Old Age Death", "Isolate", and "Unlimited Time" options, beat Empire mode.
All created officer attire:
To unlock all created officer attire, beat the Yellow Turban campaign using a created officer.
Level 4 weapons:
To unlock level 4 weapons, raise a weapon to its maximum level and kill 500 enemies.
Six items for officer:
To unlock the ability to use six items for an officer, defeat 1,000 enemies in a stage.
Red Hare Harness:
To get the Red Hare Harness, use the Development assignment card three times on Naman. Then, use the Production assignment card on Luo Yang.
Shadow Horse:
To get the Shadow Horse, get the northwest land owned by Ma Teng and fully develop it. Then, go to "Assign" > "Wester Trade" and repeat until you get the Shadow Horse.
Juggernaut and Wood Ox cards:
To unlock the Juggernaut and Wood Ox cards, place Zhuge Liang and Yue Ying in the same province.
Assignment cards tip:
To get better assignment cards, play Empire mode on Hard or Chaos.
1,000 KO Medal:
To earn the 1,000 KO medal, kill 1,000 enemies in a stage.
Achievements:
Available Officers 10 (20 points) - Have 10 non edit officers in Empire mode.
Available Officers 20 (20 points) - Have 20 non edit officers in Empire mode.
Available Officers 30 (20 points) - Have 30 non edit officers in Empire mode.
Available Officers 40 (20 points) - Have 40 non edit officers in Empire mode.
Available Officers 50 (20 points) - Have 50 non edit officers in Empire mode.
Available Officers 60 (20 points) - Have 60 non edit officers in Empire mode.
Available Officers 70 (20 points) - Have 70 non edit officers in Empire mode.
Available Officers 80 (20 points) - Have 80 non edit officers in Empire mode.
Available Officers 90 (20 points) - Have 90 non edit officers in Empire mode.
Available Officers 100 (20 points) - Have 100 non edit officers in Empire mode.
Available Officers 110 (20 points) - Have 110 non edit officers in Empire mode.
Available Officers 120 (20 points) - Have 120 non edit officers in Empire mode.
Available Officers 130 (20 points) - Have 130 non edit officers in Empire mode.
Available Officers 140 (20 points) - Have 140 non edit officers in Empire mode.
Available Officers 150 (20 points) - Have 150 non edit officers in Empire mode.
Available Officers 160 (20 points) - Have 160 non edit officers in Empire mode.
Available Officers 170 (20 points) - Have 170 non edit officers in Empire mode.
Available Officers 180 (20 points) - Have 180 non edit officers in Empire mode.
Available Officers 190 (20 points) - Have 190 non edit officers in Empire mode.
Available Officers 200 (20 points) - Have 200 non edit officers in Empire mode.
Available Officers 210 (20 points) - Have 210 non edit officers in Empire mode.
Available Officers 220 (20 points) - Have 220 non edit officers in Empire mode.
Available Officers 230 (20 points) - Have 230 non edit officers in Empire mode.
Available Officers 240 (20 points) - Have 240 non edit officers in Empire mode.
Available Officers 250 (20 points) - Have 250 non edit officers in Empire mode.
Play Yellow Turban Rebellion (20 points) - Play the Yellow Turban Rebellion special stage.
Play the Battle of Hu Lao Gate (20 points) - Play the Battle of Hu Lao Gate special stage.
Play the Battle of Guan Du (20 points) - Play the Battle of Guan Du special stage.
Play the Battle of Chi Bi (20 points) - Play the Battle of Chi Bi special stage.
Play the Battle of Yi Ling (20 points) - Play the Battle of Yi Ling special stage.
Cleared Yellow Turban Rebellion (70 points) - Gain control of all 25 areas in the Empire mode scenario, Yellow Turban Rebellion.
Cleared Dong Zhuo in Luo Yang (70 points) - Gain control of all 25 areas in Empire mode scenario, Dong Zhuo in Luo Yang.
Cleared Divided Land (70 points) - Gain control of all 25 areas in Empire mode scenario, Divided Land.
Cleared Battle of Guan Du (70 points) - Gain control of all 25 areas in Empire mode scenario, Battle of Guan Du.
Cleared Flames over Chi Bi (70 points) - Gain control of all 25 areas in Empire mode scenario, Flames over Chi Bi.
Cleared A Gathering of Heroes (50 points) - Gain control of all 25 areas in Empire mode scenario, A Gathering of Heroes.
Source: http://www.gamingcheats.com/Xbox%20360/11962/dynasty-warriors-5-empires-cheats.html
