Borneo is the third chapter of Among Thieves. Nate and Sully ventured into Borneo to find Lazarević's camp, meanwhile arming the explosive charges that Chloe had planted for the planned diversion.
Completing the chapter in less than 6 minutes and 30 seconds in Among Thieves Remastered will unlock the silver trophy Staying Dry.
Story[]
Sully retrieves the detonator.
Nate and Sully began their venture into the Borneo jungle in search of Lazarević's camp. Their first task was the retrieve the detonator Chloe left for them and to arm the first explosive. Venturing further, they encountered some soldiers patrolling around, whom they killed to stop them from alerting Lazarević.
Nate arms the explosives.
Eventually they discovered the first camp, spotting several soldiers stationed around the compound. After clearing all of them out, Nate armed the remaining charges placed around the area. Pressing on, he and Sully climbed out of the compound and headed towards the waterfalls. They then spotted two unarmed soldiers in the lake below, trying to repair a broken water pump.
Sully figured taking them down would be easy, but Nate was a bit skeptical, shortly before a soldier appeared behind them and kicked Sully in his torso. Nate grabbed the guard, and they both fell into the lake with the other two guards. Unarmed, Nate single-handedly took them all down in a melee, then climbed back up to Sully. The two then followed the pump's hose to the camp, where they would find Zoran.
Walkthrough[]
Crossing the jungle[]
Proceed forward upon gaining control of Nate, until you reach the first charge that Chloe planted, which will be automatically armed in the resulting cutscene. Keep moving through the jungle until Sully and Chloe alert you to a pair of soldiers, whom you can either take out through stealth attacks or by initiating a gunfight. Note that for future fights, weapons dropped by stealth-killed enemies retain more ammunition.
Nate stealth-kills one of the soldiers.
If you want to start a gunfight simply aim for the head while using the .45 Defender. The AK-47 carried by the soldiers meanwhile is better off with a spray and pray approach at the torso, due to its higher rate of fire and lower accuracy. If you prefer to stick with the stealth approach, wait for the first two soldiers to move and one to put his back to the log. Approach him and take cover behind this log, wait for the other to be turned away, then press 
to perform the takedown. Take his AK-47 to use as a secondary firearm. Now dispatch the second one while his back is turned, or as he walks by again.
In the next area another pair of soldiers patrol the ground floor, while a third oversees them both from a small plateau. You can stealth kill the pair, but the third soldier will most certainly spot you if you try to reach him. Triggering a fight will spawn an additional three soldiers from the cliff on the right, so be sure to have a good cover position once you do.
Once the area is clear, head to the back wall and climb up using the ledges to the left. Turn around and jump to the swing pole, then leap to the next ledge where the third soldier was. Head forward to find a large boulder. Get close to it and push it down using 
so that Sully can climb up. Head forward, then cross the tree over to the other side. You will be spotted by the soldiers ahead, all four of which you must take down to continue. After doing so, head for the back wall and climb up the ledges. As you climb over this area, you will be led to the first campsite.
The first camp[]
Nate prepares for a stealth takedown.
As before, you can either go for stealth or action, although you cannot avoid a gunfight past the first few soldiers. Take note of the somewhat-hidden soldier in a nook on the right side, as well as the one next to a desk on the far side. Said desk has a Wes - 44—a powerful one-hit kill (no matter where) revolver with limited ammunition. Once the fight has started you will have to eliminate all the remaining soldiers that rush your position from the far side of the camp. Concentrated AK-47 fire on the bright red generators will trigger a massive explosion, which you should make sure to time properly.
Make sure to swap positions regularly to avoid being pinned down too much, and also watch out for the two masked soldiers using Moss - 12s. Take their shotguns for yourself if you prefer their damage over the AK-47's range and rate of fire. Swap out the Wes - 44 as well if you only have one or two bullets left. After all enemies are down you will need to locate all four explosives and arm them. They are indicated by the flashing green lights, which will become red once they are armed. Each one is attached to the wooden decks in this campsite. The first can be found from where you entered the camp, the second on the opposite corner, the third on the far side of the deck on your right, and the fourth on the third deck opposite the first two, below the generator.
The pump[]
Nate and Sully spots two unarmed soldiers.
With all charges armed, you will now need to exit this campsite and make your way to Zoran's location. Follow Sully to a ladder and give him a boost up. Once he drops it down, climb up and then go right towards a waterfall. After the soldier attacks from behind, and Nate falls down into the water, you will be unarmed and will need to defeat the soldiers (who are also unarmed) with melee. The game will instruct you on melee and combo attacks, as well as the dodge maneuver () when a soldier grabs you, and the following finisher punch.
After all three are down a fourth will appear which you have to defeat without help, although the game still slows down when you need to escape their grab attack. Once done, Sully will lower a rope for you to climb. Once you climb up, Sully will point out the water hose that could possibly lead to the camp. Follow it as he suggests, and the next chapter will begin shortly.