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Unlockable Real Ending:
The ending where 47 dies at the end of the game (on Requiem) is not the game's real ending. What you need to do to achieve the real ending is to move the left joystick (it may be mouse or keypad on PC) back and forth (during the credits) until a surprise occurs.

Note that you will need to quickly eliminate all the witnesses in the level. All the guards in the main chapel carry weapons so you should take them out first. Good luck!

Glitch - Requiem Safe Spot:
On the final level Requiem -- where you have to wake up and kill all witnesses in the church -- there is a major glitch. As soon as you wake up, exit the church and head south. There will be two stone mausoleums (or sheds). Enter the one that is furthest away from you.

When the doors are closed, the guards cannot open them, and they will all come running down. You can keep opening and closing the doors as you please without worrying about all the guards rushing in to kill you.

Hint - Waste Not Want Not:
It is possible to get enough money to purchase all upgrades but don't buy everything. Some upgrades are replaced by better upgrades, so you should only buy the ones that you are going to use. For example, there might be three levels of silencers but you may not want to waste money on the first and second upgrades, because you can only use the most powerful silencer.

Hint - Blasty, Blasty:
Once you've a few more dollars and decided to upgrade your Silver Ballers for more killing power, try using long slides, magnum ammo, full auto, and take two Silver Ballers. Enjoy mayhem.

Unlockable Weapon List:
Here is a list of all levels and the firearms that can be found on them, this list only includes the weapons which are fired except the nail gun. (note: the weapons collected on the level death of a showman do not count)

A vintage year-snub nosed, SAF SMG, TMP, and the Shotgun

Curtains down-MP5, SLP.40 pistol

Flatline-SLP.40 Pistol, TMP

A new life- SLP.40 Pistol, Bull.480, Air rifle

The murder of crows- Desert Eagle, SLP.40 Pistol, SLP.40S, MP9, SG552, KAZO TRG

You better watch out- SLP.40 Pistol, TMP

Death on the Mississippi- Desert Eagle, Snub nosed, Bull.480, shotgun, FN-2000

Til death do us part- Six shooter, shotgun, elephant rifle (elephant rifle is displayed on the wall)

A house of cards-SLP.40 pistol, SLP.40 S, TMP

A dance with the devil- Desert Eagle, SLP.40 pistol, MP7, MP5, FN-2000, Dragunov Sniper (the Dragunov Sniper is on the top floor where you check the computer it blends in with the desk)

Amendment XXV- Desert Eagle, SLP.40 Pistol, MP5, Custom 1911, M14

Requiem- SLP.40 pistol, MP7, Custom 1911