Defeat all 4 playable enemy generals plus 1 of the 2 generic enemy generals.
Keep eliminating Liu Shan's destination enemy entry points to stop him from retreating for 8~9 minutes, all the while keeping Liu Shan's HP at approximately more than half. In simpler terms, just defeat Cao Ren, Zhang He, Xu Chu, Xu Huang, plus either Deng Ai or Zhong Hui. And keep eliminating for 8~9 minutes the constantly reviving enemy entry points that Liu Shan is headed towards to surrender. Also, if Liu Shan's HP reaches approximately less than half, and says " (Isn't there anyone who can rescue me?)", the weapon is lost. A chance trick is to bring your strongest bodyguard team into the battle, and leave them right where one of the entry point captains will reappear, if you're lucky they can buy you some extra time by lowering the entry point
captain's HP a little before you reach him, or if you're very lucky, defeat that entry point captain for you. But since this is Expert Difficulty after all, don't count on that.
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