Complete Chapter 1.

Complete Chapter 2.

Complete Chapter 3.

Complete Chapter 4.

Complete Chapter 5.

Complete Chapter 6.

Complete Chapter 7.

Complete Chapter 8.

Complete Chapter 9.

Successfully complete the game.

Let Serial Killer X live.

Kill Serial Killer X.

Find one bird in Chapter 1.

Find one bird in Chapter 2.

Find one bird in Chapter 3.

Find one bird in Chapter 4.

Find one bird in Chapter 5.

Find one bird in Chapter 6.

Find one bird in Chapter 7.

Find one bird in Chapter 8.

Find one bird in Chapter 9.

Find all birds in the game.

Find 9 metal pieces.

Find 20 metal pieces.

Find 29 metal pieces.

Find 30 metal pieces.

Find 20 metal pieces.

Find 29 metal pieces.

Find the hidden television in Chapter 1.

Find the hidden television in Chapter 2.

Find the hidden television in Chapter 4.

Find the hidden television in Chapter 6.

Find the hidden television in Chapter 7.

Find the hidden television in Chapter 8.

Find the hidden television in Chapter 9.

Complete a chapter only with melee weapons.

Complete three chapters only with melee weapons.

Wield every type of debris and entry tool weapon.

Complete all chapters only with melee weapons.

Wield every type of firearm.

Drop important weapons and tools near distinctive objects or in easy-to-find spots. By doing this, you will not have to search for them later.

If you want to use big melee weapons, practice hanging back, then veering ahead far enough to hit your enemy with your weapon. Then, drift back. This makes the most of your weapons' superior reach and keeps you away from your opponents' faster weapons.

Find every crime scene clue.

Sprinting is not that useful on stairs. Save it for level surfaces.

As with all guns, it is best to save the revolver for fights against multiple enemies (or against exceptionally tough loners). Particularly weak enemies can be finished off with a combination of Taser and kicks instead.