Pritchard again will be in contact with you and will want you to go speak to one of the doctors at the Shanghai LIMB Clinic. Head inside and speak to the doctor to the left. The mission he gives you is to find an old friend of his who has he feels is making the wrong choices in life.
Now head back to the area where you dealt with the gang for the 'Corporate Warfare' achievement. Along the right hand side you should spot an sewer entrance. Take this down and head around to the left. Along this route you'll find the man the doctor wanted you to talk to - Zelezny.
Head over and talk to Zelezny and make your save. There's only one way to really do this achievement without ruining all your hard work and that is to agree with Zelezny so you avoid having to fight him and his men. Once you've spoken to Zelezny and agreed on his decisions, head back to the doctor and either convince or lie to him. Once the conversation has ended the achievement will unlock.
Point of No Return
Make sure you've completed all the side quests and collected all the E-Books in Shanghai (2) as this is your last chance as you will not be returning here, so they won't be available again.