Strange Brigade

All collectibles for this map in one video. In spoiler are the timelines.

After doing this map multiple times and sending a message to everyone that has the achievement (sorry gang) I finally found the one I was missing in a random video posted by the people who made the game. Typical.

So to save you the same trouble here are the locations until someone comes up with a handy video guide:

1) After the first beach area look for a path you can climb up on the left side of the first jungle section (it's before the gate you open by shooting targets to raise three boulders). Up here follow the path and look left at the first junction to see a barrel you can blow up to clear some vines, follow this up to the plane to find the first diary on a box right next to the crashed plane and 1st Relic inside it.

2) After the second beach section you fight some enemies to open a gate and then head up a hill to the Settlement. At the top (before going into the area with the Blue Crystal through the gate) face away from the large gate and shoot the barrel by the door of the hut opposite, it's inside on a table (also the hut you shoot the panel to open the door to the 2nd relic puzzle).

3) After clearing out the Settlement, head down the stone stairs in the next area and then down the next ramp to another open jungle area. You'll get an objective to defeat the jungle ambush which will open the door at the far side. Before heading through check the stone railing down and to the right of it (if you stand in front of the door and face back to way you came).

4) After solving the big floor puzzle there will be another jungle area, at the start go past an ammo bag and you'll come to a small stone area with steps leading down, look to the left to see a weapons crate (the one you pay to open) the next diary is on the stone railing behind it.

5) When the Ancient Temple location pops up you have to defeat a wave of enemies who climb over/under a fallen stone pillar in front of you. Once you do that it opens a door on the right to a small campsite. Go past that and through the next door, then look on the wall to your left as you exit (right next to the door you come out of) to find a lever. Pull it and open the door opposite. Go inside and roll past the fire traps to find this in the far left corner by another lever.

6) Once you fight up the hill, go past the Golden Cat door and up the steps to the last campsite. The final diary is on the right side on the stone railing overlooking the golden cat room (this is the room before the very last fight).

Number 5 was the one I kept missing as I never spotted that lever. So I hope this helps people until a video comes along. Any questions just ask.