To start, snap a pic at the
Photo Opportunity spot next to you, then go to where Nadine is so you can give her a boost to the ladder by the concrete shed. Hop off to lower rooftop to slide then jump before you reach the edge to safely grab the fence at the other side.
Here, use the handholds on the wall to the right. Climb up the pipe then use the signs to get to the next rooftop. Jump to the lower area and walk to the upper left ledge so you can shimmy across and climb to the next building. Move along the rooftops until you spot the zip line.
Treasure #1: Bullet Whistle
Before using the zip line, check behind the white barrel next to the shed.
Treasure #2: Military Service Lighter
Use the zip line and enter the shack after taking the enemy out. This collectible is on the table.
Keep moving from one rooftop to the next and you'll soon reach a building with another movable crate. Drop it below to make a hole so you can proceed.
Treasure #3: Utility Spork
After dropping the crate to Nadine below, return to where the crate once was and pick up this treasure.
Jump down into the freshly made hole and cross the beam and jump to the handholds by the wall ahead. Use those to enter another building.
Treasure #4: Travelling Inkwell
Upon entering the building described above, go to the end of the hallway on the left to find this treasure.
Continue onward and keep moving higher and you'll soon reach the entrance to Asav's office. Pick the lock until Nadine decides to break in the easy way.
Treasure #5: Tactical Compass
While searching for the disc artifact in Asav's office, you'll find this treasure on a crate behind one of the shelves.
All you need to do here is grab the picture of the Tusk of Ganesh off the wall, and Nadine will automatically locate the box housing the artifact. You'll need to pic it open though. You'll be running from Asav's goons after the scene. Your goal is to get to the river. It's difficult to give exact directions on where to go, so either follow Nadine or take the path that leads you away from danger.
Also if you manage to take a ride on all the zip lines in the city, you will unlock the
Drop Me a Line trophy.