By solving the puzzle at each tomb you will get a treasure map. If you complete all of them you get the "Intellectually Superior" achievement.
Coordinates: 53N 712478, UTM 3416188
Reward: Mountain Village Relic Map
Once you have the Climbing Axe, travel to the Mountain Village and return to the Tomb of the Unworthy at the base of the waterfall.
Coordinates: 53N 712501, UTM 3416206
Reward: Mountain Village GPS Cache Map
Once you have the Flint and Rope Arrows, travel to the Overlook camp in the Mountain village, where you looked for the rescue plane's smoke signal. Use the rope arrow to reach the upper route on the north ledge then use it again to reach the tomb.
Coordinates: 53N 712580, UTM 3416067
Reward: Shantytown Relic Map
Once you have the Rope Arrows, travel to the Helicopter Hill camp in Shantytown.
In the town there is a building painted with white murals and armed with traps. Go through the floor and you will drop down on the path to the tomb.
Coordinates: 53N 712616, UTM 3416053
Reward: Shantytown GPS Cache Map
Once you have the Climbing Axe and Rope Arrows, travel to the Windmill camp in Shantytown
Go to the southern part of town and find the caves to the east, below the gondola station. Slide down the surface to reach the ledges. Once you've climbed the ledges, follow the right passage and it leads to the tomb.
Coordinates: 53N 712635, UTM 3416007
Reward: Summit Forest Relic Map
Once you have the Fire Arrows, travel to the Hunting Lodge camp in the Summit Forest.
Go north beyond the bridge and you will find the tomb entrance with a lamppost next to it.
Coordinates: 53N 712485, UTM 3415986
Reward: Shipwreck Beach GPS Cache Map
Once you have the Rope Ascender and Climbing Axe, travel to the Survivor's camp at Shipwreck Beach.
Go the the zipline to the north and you'll reach a barricade. Use the rope ascender to break the barricade, then continue through the cave to reach the tomb.
Coordinates: 53N 712521, UTM 3415962
Reward: Shipwreck Beach Relic Map
Once you have the Climbing Axe and Prying Axe, travel to the Cliffside Bunker at Shipwreck Beach.
The tomb entrance is in a narrow passage near the top of the climbing path that leads to the bunker. Press the button up the stairs first and then press the button beside the door to enter the tomb.
Treasure map locations:Search the 14 locations to find all the treasure maps, which reveal the locations of all relics, GPS caches and documents on your map. Buying the Tier III Survival skill "Cartography" will reveal all treasure map locations on your map.
Coordinates: 53N 712382, UTM 3416112
1: On the eastern area of the map there is a broken bridge near a waterfall. To reach the waterfall, find the rock ledge with a wooden plank. Jump from there to the beam on the bridge and the treasure map will be on the crate at the next platform.
Coordinates: 53N 712430, UTM 3416148
2: After climbing the ladder you will face a large decayed building. Take the left path to reach the waterfall and then dive down into the water to find a secret cave, with the treasure map inside on top of a crate.
Coordinates: 53N 712390, UTM 3416289
3: At the Radio Tower camp, use the zipline to the east to reach the building below. You will land near a burning trashcan; the treasure map is right behind it.
4: Complete the Tomb of the Unworthy to unlock the corresponding treasure map.
5: Complete the Halls of Ascension to unlock the corresponding treasure map.
6: Complete the Well of Tears to unlock the corresponding treasure map.
7: Complete the Chamber of Judgement to unlock the corresponding treasure map.
8: Complete the Temple Of The Handmaiden to unlock the corresponding treasure map.
9: Complete The Flooded Vault to unlock the corresponding treasure map.
Coordinates: 53N 712708, UTM 3416013
10: At the location is a tall wooden scaffolding, climb it to find the treasure map at the top.
Coordinates: 53N 712561, UTM 3415929
11: Use the rope ascender on the wall behind the big cannon to destroy the wall. The treasure map is inside on top of some sand bags.
12: Complete the Stormguard Sanctum to unlock the corresponding treasure map.
Coordinates: 53N 712433, UTM 3416048
13: On the top left corner of a big pile of boxes is a small opening big enough to crawl through. The treasure map is right behind the boxes.
Coordinates: 53N 712594, UTM 3416259
14: The map is on the second floor, jump up and you can find it lying on a table.
"Chatterbox" Achievement Hint:There are seven moments during the story when you can talk to your friends. If you listen to everything they have to say you unlock the "Chatterbox" achievement, miss one word and you can't get it on that playthrough.
1: Before you search for 50 pieces of salvage, talk to Whitman.
2: After you've found 50 pieces of salvage, talk to Whitman again.
3: After helping Roth against the wolves, talk to Roth.
4: When you receive the rope arrows, talk to Roth before using the zipline.
5: Upon reaching Shipwreck Beach, talk to your friends Sam, Reyes and Jonah.
6: Before going to the Endurance to help Alex, talk to Whitman, Sam, Jonah and Reyes at the beach camp.
7: After you've gone to the Endurance, talk to Whitman, Reyes and Jonah.