Just a scratch Achievement
Just a scratch25
You didn’t go wounded once in a mission (medium, hard or insane)
To unlock this achievement, you need to complete a full mission, without ever going into wounded state, while playing on at least Medium difficulty. Of course, this would be easiest done on Medium difficulty and you can reload any of the missions you have completed, that you find easiest and finish them on Medium without being wounded to unlock this achievement. If you do get wounded and need to be revived, then you must restart the entire mission again.
*Note, a good mission to obtain this is 'Last Resort' as it is only 2 chapters long, so if you do go wounded, there isn't too much to have to repeat.