Secret. In chapter 1 – “Factory”, immediately jump slash onto the building to the left and search the dead body.
Don’t hang up!
Secret. In chapter 1 – “Factory”, hang up the phone repeatedly.
Secret. In chapter 2 – “Hotel”, kill the target with a throwing weapon before they jump.
What a bad idea
Secret. In chapter 2 – “Hotel”, jump off the balcony after finding your target.
Secret. In chapter 5 – “Studio”, roll past the boss when they shoot and slice them in the back repeatedly.
Secret. In chapter 6 – “Mansion”, a thief is in the upper-left room of one of the areas. Wait for them to leave, then search the room.
Secret. In chapter 9 – “Slaughterhouse”, don’t trigger any monitors. Cut any red cables you spot before killing any enemies nearby. On monitors without cables, inspect the ceiling for cameras and roll past them. (Disregard their orientation, they only see straight down.) Finally, search the room full of red barrels.
Secret. Collect the four previously mentioned keys.
Secret. In chapter 10 – “Bunker”, kill yourself with a Molotov as you enter the next elevator.