It helps to build up on their island, rather than ferrying troops from your base all the time. The Jin have a fair amount of cavalry, so I found Pikemen to be a cheap and effective counter. 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. 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. One helpful tool shown in this video is the 6 x Bombard Cannons that will join you if you are able to reach them.
The faster you attack them, the easier they are to defeat. 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. Time is of the essence with this achievement, so bear that in mind from the start. Age of Empires II: Definitive Edition (PC) - Achievement - I Was in China Beforeĭefeat the Jin before they start constructing a Wonder in the third Genghis Khan mission 'Into China'.
