Successfully complete the game under the Medium difficulty setting.

Complete the indicated task to unlock the corresponding cheat when any level is replayed through the "Level Select" option. Note: Enabling cheats will prevent achievements and trophies from becoming unlocked.

Bullet Cam on Every Kill: Find all clues.
One-Hit Kill: Complete the game under the Hardcore difficulty with Free Aim.
Unlimited Ammo: Collect all golden gun pieces.
Unlimited BulletTime: Earn a gold-medal score on all levels in Arcade mode.
Unlimited Painkillers: Complete the game under the Hard difficulty with Free Aim.

Successfully complete Story mode under the Old School difficulty setting. This is a pixelated Max Payne, based the Game Boy Advance version.

Successfully complete the game.

Successfully complete the game under the Hard difficulty setting.

Successfully complete the game under the Medium difficulty setting.

Successfully complete Story mode under the Old School difficulty setting. This is a pixelated Max Payne, based the Game Boy Advance version.

Successfully complete the game.

Successfully complete the game under the Hard difficulty setting.

After beating the game, or at least a level, you'll notice that you'll have a total of five unlockable cheats when attempting to replay a level via the "level select" option. Here's how to unlock them.

Unlockable	How to unlock
Bullet Cam on Every Kill	Find every clue.
One-Hit Kill	Beat game on Hardcore with Free Aim.
Unlimited Ammo	Collect all golden gun pieces.
Unlimited BulletTime	Earn a gold-medal score (about 7,000) or better on every level in arcade mode.
Unlimited Pain Killers	Beat game on Hard with Free Aim.