Ghost Blade HD (HP)

It is quite simple with two players on Easy. In fact, a single player with two controllers can do it without undue difficulty which is how I unlocked the Trophy. I plugged in a second controller and set it to a guest account. I configured the second controller so the was the focus button. I then started a two player game & put some tape on the button so the second controller would fire focus shots & not be completely defenseless.

With the first player doing most of the work, the second player is not very vulnerable. On easy, bombs will automatically detonate if the ship is in danger so the ship will survive at least until its bombs are exhausted. I had to continue a couple of times with the defenseless second player. To continue, I had to quickly remove & reapply the tape on the button the second player was using for the focus shots. The trophy unlocks as soon as the final stage is cleared.