Max Payne

The End Combat also known as the Secret Finale is a special bonus challenge level that can only be found in Part III's Chapter 8: End Combat. Normally, this is only unlocked by completing Max Payne on the hardest difficulty called "Dead on Arrival", however, the majority of players will not have to playthrough that difficulty because they're abusing cheat codes throughout their playthroughs. Doing the Level Select cheat code will also unlock this special bonus challenge, enabling you to skip doing a Dead on Arrival playthrough.

In order to unlock the trophy much faster, do the Level Select cheat code and then select the following mission:

During End Combat (which is always in Bullet Time), just use cheat codes and kill all 16 enemies. After killing the last enemy and completing the game's ultimate challenge, the trophy will unlock. Additionally, End Combat is the best place to attempt the Four for the Price of One trophy.