Rusty Gun (EP)

Story related, can't be missed

This trophy will unlock during the final cutscene shortly after beating the final boss.

You will meet Viktor at the end of the 17th level. This jetpack-toting villain will remain airborne while raining fire from above and below. Note that the floor has ducts that randomly catch on fire - make sure to not stand on any of them. Use your spread shot to shoot down the boss and enjoy the final cutscene. Here is a video but beware, because it contains some very minor spoilers:

https://youtu.be/w-AJF6i2l2U