All created officer attire
Create a basic officer, then successfully complete the Yellow Turban campaign on any difficulty setting to unlock all created officer attire.
Level 4 weapons
Raise a weapon type to the maximum levels, then defeat 500 enemies to unlock the level 4 weapon type for that character. Note: Each type of weapon is only unlocked based on your own weapon. Hence, a sword unlocks level 4 swords, etc.
Red Hare harness
To get the Red Hare harness, you need money and the Development and Production assignment cards. The cities that are able to develop the Red Hare harness are Nanman (in the Gathering Of Heroes campaign) and Luo Yang (in all other campaigns). You must use the Development assignment card (under the “Equipment” category) on that city three times. After that, you must then use the Production assignment card on Luo Yang. This will produce one Red Hare harness. If you want another one, just use the Production assignment card on it again.
Getting better assignment cards
To get better assignment cards, you must play Empire mode on the Hard or Chaos difficulty setting. Not a lot of good assignment cards will be unlocked on the Novice or Easy difficulty setting.
Getting desired results
Always save your game before choosing policies or going into battle. If you do not get desired results, load your saved game and try again. By doing this, you can get better results with policies and never lose a battle.