Thief - Child of the Shadows - Finish a single chapter without alerting anyone [Bronze / 10G]

The best place to do this is Chapter 1: Lockdown. This chapter is very short and has few enemies. The eye-symbol above an enemy's head may never turn fully red. If it does, they enter combat mode and you are being spotted. If this happens, immediately reload the last save game.

Always stay in the dark, don't shoot any arrows and don't knock out any enemies. Stay crouched all the time and use the shadow dash to get from one dark area to another when enemies are not looking your way.

Explore the area and take alternative routes where you don't have to deal with any guards.