Rogue is an achievement/trophy in Dishonored and Dishonored 2.
How to Acquire
In order to get this achievement in Dishonored, Corvo Attano must assassinate 10 unaware targets. In Dishonored 2, Corvo or Emily Kaldwin must kill or knock out 20 unaware enemies.
This can easily be achieved through a variety of ways, including headshots with the crossbow, drop assassinations, and sneaking up behind the enemy and stabbing them with a sword.