Solarii Fortress
Find Sam
Head straight and pry the the doors open and then continue down the halls and outside on the roofing to work your way around the outside of the building and up a craggy wall. Continue shimmying across the ledge until you reach a patio and head inside for a cutscene. After the scene, follow the men across the roof, down a zipline and across a gap to climb up and run into Whitman.
Survive the Ambush
Make sure to keep moving, as dynamite will be coming from all directions. Use the pillars for cover and circle the room, staying out of the middle, as you take out enemies as you go.
Escape the Inferno
Find the doorway on the side of the room with a spotlight that shows you where to go and gain 100 XP.
Fight Your Way Out of the Palace
As you turn the corners, take cover and kill the Solarii that try to surprise Lara. With a bit of caution you should make it outside to the cutscene with ease. Nikolai's turret will tear through the weak structure walls, so staying still is a bad idea. Quickly roll from wall to wall until you reach the building on the left with a craggy wall and climb up and zipline down. After another quick scene Lara will gain the Grenade Launcher and 250 XP.
The Grenade Launcher is not only handy for groups, but it also allows Lara to get through the fortified doors ahead. The enemies ahead can easily be taken out with your new weapon, so take them out and head for the Solarii Fortress Base Camp. After a quick skill and weapons check, head for the craggy wall and blast through to the outside and gain 100 XP.
Regroup with Sam
Zipline down and blast the door and prepare for a firefight. Enemies will swarm in to the upper balconies and rush at your from the level below. The first thing to mention is that Survival Instincts is your friend and will help you spot enemies in the harsh weather. Don't be afraid to get out of the streets and into a building where you can take a second to heal and when it is clear, loot all the bodies.
As Lara passes the fountain at the end of the street, another spotlight will hit her and a Solarii will man a turret. Bob and weave from cover to cover and climb the building on the left to reach higher ground. Quickly hop on the zipline to your right and take out the two enemies and then take cover to heal. Head into the room on the left and wait for a break in the gunfire to lop a grenade across and destroy the turret and then take the zipline for 100 XP.
Escape the Solarii Compound
Crossing the river will only take you back to where you came from, so climb the nearby planks to a zipline and take it across to the other side and climb the craggy wall. When a Solarii lobs a Molotov Cocktail inside, Lara will need to quickly exit by climbing the surrounding platforms to reach the ledge where the man was and zipline out, gaining 400 XP for the chapter end.
