After doing everything and not getting the achievement i went back on a new save.
In Act Three, First thing is the most important. Do not talk to anyone until you do the following i was moving from the left to right clockwise. Path you go does not matter just DO NOT TALK TO ANYONE YET:
Look at Barricade
Look at Graffiti
Look at walls next to table
Look up to your right at the Barbed wire
Look at the piles of heads on the ground
In the middle look at the Heads on sticks and the flagpole
Check the Rubble near the graves.
Check all 3 graves, not sure if it matters but i didn't spit on Marlon's grave.
After the 3rd grave you will get the achievement.
Thanks to Blissed Away
for pointing out You can use LB or LT to view points of interest.