With Dynasty Warriors: Origins, the developers at Omega Force decide to mix things up after many decades of telling the same old tale. Here, players take on the role of a unique hero who, rather than controlling one of the many dearly loved historical figures from the series, must choose which of three great factions to be with in order to bring peace back to the world.
At that point, a Peacekeeper will start working against them to make sure one of the other two factions comes into power. Players of Dynasty Warriors: Origins can foil Bailuan's evil plans to win Shu's true ending and the "A Truly Just World" Trophy / Achievement.
The Shu ending requires defeating Cao Cao in the Battle of Changban that occurs in the fifth and final chapter of the game. Compared to the other two, this secret ending is by far the easiest to unlock in Dynasty Warriors: Origins, as players can unlock it by altering the fate of just one character, and there aren't many time constraints. Switching to the Historian difficulty setting will make everything a bit easier and increase the chances of success, though.
Once Cao Cao's main force reaches the circular area toward the top of the map, players should continue with the battle as usual. Now is the time to vanquish any enemy officers attempting to attack Liu Bei. Then, they should proceed north to the Wei soldiers, killing all the officers that stand in their way. When they reach their destination, they should waste no time in trying to kill Cao Cao. It would be better if they dispersed his huge army first, but Liu Bei is still in peril and edging ever closer to the escape point at all times, so they should probably wrap things up here as soon as possible.
Once Cao Cao falls, players must defeat Bailuan in a duel to end the battle, after which the Fate Altered message will appear onscreen. After they have completed the last two battles of Chapter 5 in a normal fashion, they will see the Shu true ending. If you plan ahead, you can obtain the true ending in your first playthrough. However, if you screw up, you can always just restart from the Battle of Changban by going to the Story menu at the Inn once you've completed Liu Bei's storyline.
Having finished the Shu tale with its true ending yields the "A Truly Just World" Trophy / Achievement.
Now that you know How to Get Liu Bei's True Ending in Dynasty Warriors Origins, apply this guide and find it easily.