Question: How can I unlock cheats in Max Payne 3? If I turn them on, can I still generate stats and earn trophies/achievements? If not, are stats and achievements permanently disabled for that save file?
Answer: To see what legitimate cheats are available in Single Player, go to Chapter Select in Story Mode. Scrolling through the cheats will cause a description to appear for how to unlock it.
While you are using cheats, stat submissions and trophies/achievements will be disabled. However, you can play without cheats again and resume earning stats and trophies/achievements.