Good Soul

This achievement requires you to act fast. On the second trip to Hengsha Island, Faridah Malik will have a crash landing, and you will be attacked by Belltower mercenaries.

There will be a variety of enemies, in order of decreasing weaponry: Box Guard, Sniper Rifles/Heavy Rifles, Shotguns/Machine pistols. These enemies should be taken out in that order. Save an EMP grenade for this occasion, and toss it at the Box Guard to kill it instantly. If you are playing on the Hardest difficulty, Cloaking might be a good idea to allow you to move to a more strategic location before you start firing.

But basically, to get this achievement, kill everyone before Faridah Malik dies. She'll fly off afterwards if you're still alive; be sure to get everything, as you cannot come back to this area afterwards.

Sometimes a robot is thrown down during the battle (after dispatching the heavies), but this doesn't seem to be the case for everyone. What factors influence this (randomly?) is unknown at the moment. Simply keep an EMP grenade in case you encounter the bot here. Additionally, in some cases a gas grenade is thrown by one of the enemies at the heli - this also doesn't seem to happen for everyone.

It is also possible to get this achievement while staying pacifist, by using cloak mode and the stun gun: Simply become invisible, run at the enemies, stun them and keep your energy high to stay cloaked. As the enemies only fire at your last known position (the position you have been when firing the stun gun) it's advisable to keep moving all the time. This is very easy on normal difficulty, not yet confirmed on hard.