Immortal Realms: Vampire Wars

I had trouble getting this one to pop. Doing some research I noted that this trophy had been bugged in the past but was specifically fixed in a patch they released. So I didn't give up. Here is what worked:

When doing these battles, once you reach the objective, you have an option to force the game to recognize this end by clicking the left directional button and clicking on Objectives. That is where I was making the mistake. What you want to do instead is let the end objective be reached and continue playing until the game actually is the one that recognizes the objectives being met and confirms it to you. That worked. The other way didn't. I tested it and that is how I stumbled upon the solution.

I did not have any trophy issues with the other sandboxes, but if you do, this solution may well work for them too.