Call of Juarez: The Cartel
51 Achievements
17-21h
Protect and serve
Don’t kill any of the civilians on the marketplace during Juan’s chase.
15.9%
How to unlock the Protect and serve achievement in Call of Juarez: The Cartel - Definitive Guide
If you are careful and make sure you can see someone shooting a weapon before killing them, you should be fine. Most of the civilians cower down, helping you not kill them. A lot of enemies take cover behind stall counters where there may be civilians, so I would hold off on grenades during this part.
This will unlock at the end of the market area (in mission) if you did not kill any civilians.
You will be able to get this trophy in Chapter 14. After you perform the Team Entry you will go along a road with some cars parked at the end. There will be a portal that you have to open. After you open it the marketplace is in front of you, just make sure not to kill any civilians for trophy to pop up. The easiest way is to use the invincibility glitch and just run from beginning to the end of the market without killing anybody, should take about 15 seconds to complete.
The “Juan Chase” level is Chapter 14, and the marketplace is after after the short driving section after passing the train.After exiting the car, you will fight your way through some alley ways. You will be in a "Cantina" (a BAR) right before you enter the market place. After exiting the BAR/CANTINA you will run up a hill and enter through a wooden door on the right side of a wooden fence. This is the marketplace. Here there are food vendors and such in an open area. Simply run through this area avoiding enemy conflict. If you really want to kill enemies ensure it’s with a melee, thus no stray bullets clip an unsuspecting civilian.
...and here is a vid!!!!
Personally, I got it on the hard level by shooting all the enemies, so the achievement shouldn't be too difficult!