The enemies in this mission have more health and do not die so quickly by your pistol shots, giving you more attempts to incapacitate them.
One area this can easily be done is in Mission 8: Allagra Fortress. Then, move close to them, take out the sniper rifle, and shoot between their legs to get 'The Nutcracker - Sweet!' achievement. Shoot an enemy in the foot with the Welrod pistol (or another weak pistol/rifle).
Either carry the dead body and drop it where enemies can see it, or throw some stones to lure them. When an enemy comes to investigate, it will explode and you will get the achievement. To get the 'Dirty Tactics' achievement, you must place an explosive on a dead body (anything except Stick grenades work).
