Going after Shadow/Ghost achievements may be tricky as game provides statistics of the mission only after it is completed.
There is a MOD adding "Statistics" in game menu and visible warnings when you are spotted or a kill occured during gameplay.

Link to MOD --> DIshonored-MissionStats [github.com]

All the information on how to install it is on that code repository or following links, provided in description.
For actual download see "Releases" section.