Follow PHARREAL87 guide, it is a good method.
It is no use to stay above 2000 trophy's, as people on the verge of defeat will quit out anyways
- It is safer to have a trophy number between 1000-1500. The reason why you should drop so low is because when you're above 2000, you won't likely see renaissance villages. While at around 1000-1500, these aged-based villages will be alot more common.
- Those aged-based players want to gain as much gold as possible in order to progress to the final stage of the game. We can help them by placing all out gold storages outside the wall, along with the money producing buildings. Being certain they will earn alot of gold from you, won't make them quit out. And have alot of gold in stock.
** This tip is not recommended though. I personally placed the storages inside the wall. **
Hope this helps, at least that's how I'm going for this achievement - and it is working well. Only minus point for me is that I'm not as active as I should have to be, in order to speed up the progress.
Here's also a video showing my defence setup and a replay of a defence win. As you can see, they will always attack the resources first. And having a good defence setup near the resources will almost garantuee you a secure win.