It's a good idea to play through the game twice. First, on easy to get all collectibles, speed demons, swan dives, grenadiers, etc. and familiarize yourself with the puzzles.

Then play the hard difficulty. Skip past some enemies and do not worry about the other achievements. You'll breeze through the puzzles, too. If you play through on easy and get all collectibles, you will still have those when you start on Master Survivalist. So your health bar is maxed from the start.

-Try and get these on your first play through. This doesn't unlock just because you have the other three Speed Demon achievements unlocked, they need to all be done in one game.

- This works just like the Swan Diver achievements. You have to get them in one succession. If you don't get it, then reload the save "Southern Mexico Xibalba" and play until you finish the Valhalla maze. It will take about 45 minutes (skipping collectibles) to get to all three challenges and should unlock when you pass the two poles in the maze.

-Do the times quickly since there's no indication that you finished in the set time.

Note: Reloading the save on your first play through will save over the previous auto saves, so you'll have to grab all the collectibles again.

-Only have to kill five enemies. Run over anything you can. You can hit the panthers and have this in no time.

-( + ) or ( + ) and steering L or R makes Lara do a doughnut. While she does this, panthers, spiders, etc. will kill themselves running at you.

- This will come with little practice and is similar (yet different) to the adrenaline head shot in Tomb Raider: Anniversary. General combat will gradually increase the adrenaline level. It must reach the top before Lara can perform an Adrenaline Head shot. At the beginning of some battles, the gauge will already be full. Use this to your advantage.

Fill the adrenaline gauge, (the smaller silhouette of Lara in top left of HUD). Press when the enemy draws close. Slo-mo will engage and you must quickly move your red reticule into the shaded gray area on an enemy's head. Then shoot with .

A quick and early way to get this is during the beginning of the Coastal Thailand area (level 3). You climb up a cliff side and are attacked by some tigers along a river. After dispatching this first group, you then need to climb some ruined columns to reach an upper area. Once on top, you will get a message about using the adrenalin headshots.

The message will continue as you make your way under some branches and shimmy across a ledge. As you come out on the other side you will be attacked by 3 tigers. Immediately kill the first one with the adrenalin headshot. Now try to build your adrenalin meter up again by shooting at the other 2 tigers. It is possible to fill the meter 1 more time before killing them both so you can get a maximum of 2 adrenalin kills at this one location.

Once all three tigers are dead, jump off the cliff you entered the area from and kill yourself. You will restart right back at the top and can do it all over again. If you can manage 2 adrenalin kills per attempt, it will only take 4 more tries to get your 10 total kills. If you can only manage the first kill on each attempt you will replay this section 9 more times. Either way, the achievement can be yours within 10 minutes and then you don't have to worry about adrenalin kills for the rest of the game.

Simply complete the DLC mission "Beneath the Ashes". If you get stuck, check out THIS WEBSITE for detailed walkthroughs.

Tips:
-The shotgun is effective for large enemies up close. You can switch for other weapons in the PDA if you deplete your shotgun ammo.
-If you die before a check point, you do not have to recollect a treasure that you have already picked up. This is not the case for medkits.
-You can save your game at any time. You should always manually save before turning off your console.

Beneath the Ashes (1 Relic and 28 Treasures)

1. At the start, turn on your light. Then turn around and kick the vase.

2. After the slo-mo bridge collapses and you grapple the ring, swing straight across to other side. It's in a vase to the right.

3. Looking at the bridge frame, climb the wall on the right and jump back to the frame. Balance walk to the surface on top of the frame. Credit to: Little Templar

4. After you crawl through the tunnel, there's a "right gate" and a "left gate". You can see it in the water in plain sight on the right.

5. A treasure is located on the ledge above the right gate.

6. You come to a room with a large water wheel on the left. Dive underwater and look behind the first pillar on the left.

7. As you climb up to the left of the large wheel, kick the vase on the ledge in front of a barred door.

8. As you swim through the underwater tunnel, take the first right up high.

9. After you come up for air, dive back down and look in the corner.

10. You'll come to a room with a pole in the middle. Climb up, perch on top and jump to the ledge with the vase.

11. In the next large room with a wet floor (this room will eventually have the spinning-blade columns and higher water level), perch atop another pole and jump to the wooden beam. Instead of wall jumping to the bar above, jump to the open door. Go left to a dead end and a vase is in plain sight when a spider attacks.

(Do not repel up to the ledge. Go through the door below it first.)

12. After you wall run to the door below a ledge (a ledge you'll later explore) you'll ascend some stairs. At the top of the stairs, turn around and check the corner for the vase.

13 & 14. Next you'll shimmy some ledges and see a pillar below. Jump and slide down the pillar to get these in the dead end area.

15 & 16. In the room with a large pillar in the middle with spiked rollers around it, you can find the two vases at the bottom. One is next to the pillar.

17. Shimmy around the pillar and jump to the available ledge that has two boards to pull together. A vase is in plain sight in the corner. Look across the room to see #18.

18. Back in the water wheel room, you have to jump across and grapple a ring. Wall run to the left under the stairs to grapple another ring. (You can actually jump back out and grapple this ring again after you pick up the treasure.)

19. Grab this in the corner once you jump from the spinning spiked column.

20. After you leave the room with the spinning pillar, you'll kill a thrall soldier and some bats. Swing to the small ledge on the right in plain sight. Now save your game!

21 & 22. Shimmy around and jump to the pillar and slide down to the bottom. These two are at opposite ends in vases. (If you shimmied and jumped to the next ledge, you can't get back to the pole, so reload the save.)

-You come to the dragon puzzle room.

23. Perch on the second pole, and instead of jumping to the wooden beam toward the middle of the room, jump to the other wooden beam. Navigate up to the ledge above that beam.

-Now solve the dragon puzzle to spin the columns with blades. (You can see treasure #27 next to the dragon statue before you move it.)

24. Jump in the water on the ladder side. Climb the wooden beam. Wall jump to the pole and perch. Jump out and grab the ring. Repel up and wall-run to the ledge. Kick the vase.

25. Now jump out and perch on the pole. Look down to the other side of the room and you can see the treasure on a ledge.

RELIC -Crawl through the tunnel below #25. You come to a room now filled with water. Climb out to one ledge then jump to the other. Here's some visual help.

26. Back to the dragon statue. Repel down from the ring on the dragon statue and make your way to the first blade-spinning column. Jump from the column and grapple the ring. Then wall run left to the ledge.

27. Jump from the second blade-spinning column to the ledge.

28. Before you swing across to the fenced-in area, hang from the ring. Look right and you can see the treasure. 

-See "Master Collector" above or this video: