Kill 50 Enemies by Melee-Attacking from Behind

Kill 10 Enemies with Grenades While Hanging

Finish the Game on Crushing Without Changing the Difficulty

Beat 'Chapter 5 - The Fortress' in less than 10 minutes

Collect all Trophies

Complete the game (any difficulty)

Collect all phonograph cylinders

Inspect all objects

Kill 7 enemies with silent takedowns

Kill 25 enemies during Blacksight

Kill 40 enemies with science weapons

Kill 75 enemies with pistols