Age of Empires II: Definitive Edition (PC) - Achievement - I Was in China Before
Defeat the Jin before they start constructing a Wonder in the third Genghis Khan mission "Into China".
Time is of the essence with this achievement, so bear that in mind from the start. The Jin are your most powerful opponent on this mission and they normally start to construct a Wonder around 25 - 30 minutes in - This can vary a little. The faster you attack them, the easier they are to defeat. One helpful tool shown in this video is the 6 x Bombard Cannons that will join you if you are able to reach them. This really helps as it's difficult to get an effective siege group together in the time that you need it, so take advantage of these and keep them alive as best you can. You can defend against your other enemies quite effectively just by blocking them off and building a castle at your base, so you can focus solely on attacking the Jin once you've done this.
The Jin have a fair amount of cavalry, so I found Pikemen to be a cheap and effective counter. It helps to build up on their island, rather than ferrying troops from your base all the time. You don't need gold or stone early on much, so try and focus on food and wood, but there should be a little time to get some gold or stone at some point - The stone can be particularly helpful to build castles in the Jin territory as you are pushing. Just make sure you keep the pressure on them. It's not good enough to just have them on the ropes, you really need to finish them or they may still randomly build a wonder.
*PLEASE NOTE* This achievement was bugged and wouldn't always trigger in previous versions, but triggers fine in the current version