The Escapist Achievement in Dishonored
After Coldridge Prison, you eluded 5 pursuers at once without killing them or leaving the map
How to unlock The Escapist
You must have 5 people actually pursuing you. They must be alerted and in attack mode. When the game says do not leave the map, it means do not go to a door or area that makes the game load another part of the map you can't visually see. There are plenty of places to get this achievement, just count your guards or allow them to sound an alarm (better yet, sound it yourself).