Fortune's favorite Trophy in Iron Sea Defenders

This is likely a trophy that you won't get naturally. I wouldn't worry about it until you have finished every Level. If you don't have it, then load up the first Level and let the first wave entirely hit your base (don't build any towers). Then start the second wave, and let enough enemies through to take your remaining HP to 1, then build a tower and stop the rest.

I have created a video outlining how to do this.