Keep damage to the horse carriage to a minimum.
Defeat Yu Jin.
Defeat Yue Jin.
Defeat Li Dian.
Achieve 200 KO Count.
The first priority is to protect the horse carriage. As much as possible,
stay beside the horse carriage at all times. You can defeat Yu Jin, Yue Jin, and Li Dian the 1st time they appear to attack the castle, or the 2nd time they appear together with ambush troops. If you defeat an enemy general, that enemy general will not appear later together with their respective ambush troops. It doesn't matter either way, but the advantage of defeating at least one of them the 1st time they appear is that Guan Yu can take their horse and move around much faster the remainder of the battle. It is acceptable for the Horse Carriage In Danger message to appear 3 times. But if the message appears for the 4th time, the weapon is lost.
Get 800 kills in Hard Mode
On hard mode get 50 kills in 4 minutes
Get 100 kills in 3 minutes on hard mode
Achieve 300 KO Count in under 4 minutes on hard.
Get 100 kills in 6 minutes and 35 seconds on hard mode
Get 300 KO Count in under five minutes and win with the difficulty on hard
Achieve 100 KO Count in under 4:30 minutes on hard.
Don't let any one pass the bridge and kill all generals on hard
Kill Cao Ren, Zhang He, Xu Zhu and Xu Huang on hard mode
On hard mode, get 400 KO Count before Xiahou Duns reinforcements comes
Before your ally troops get eliminated, defeat Guan Xing and stop the rock attack on hard
Beat Hua Xin, Hua Xiong and Lu Bu in under five minutes on hard