I've created a two-part 100% walkthrough video. It covers every single achievement in the game except the co-op ones and the speedruns, but the co-op are self-explanatory and the speedruns are super easy once you've played a level, since you can usually just run past everything and solve the puzzles most of the time. Contrary to some reports, you CAN get the gold points challenge on EVERY tomb on your first time through in solo play. Follow along with the video below as you play through the game (and part 1) to have your 1k in 8-10 hours tops. A detailed text guide follows after the time stamps for those that prefer it, copied over from the walkthrough I've written for this game.
This achievement is story-related and will unlock the first time you complete Tomb of the Lamplighter.
Timestamps:
0:07 - Tomb of the Lamplighter
13:55 - Tomb of Sobek
18:20 - Challenge Tomb #4
19:12 - Tomb of the Architect
29:44 - Tomb of the Torturer
43:11 - Pharoah
45:32 - Tomb of Set
51:29 - All Hub World Red Skulls
Challenges: Bronze/Silver/Gold – 85,000pts; Complete in under 10:00; Collect all 5 Red Skulls; Complete the tomb without being damaged by hot water; Use a spike wall to kill a Sobek warrior; Step on all of the Ammit crumbling floor tiles in the exit sequence
You’ll probably need to do a run in co-op to get the points challenge, either before or after (or while) you do the other non-speedrun challenges. From the start, head down the stairs to hit the switch. A short scene will show you the new torches. Light the one above and to the right, and climb up onto the upper ledge. Use the grappling point to climb up and light the next torch, which raises a platform out of the water and drops the spikes above. Jump onto this and grapple up to the high ledge where the spikes dropped when the torch was lit. Light the next torch and use the grapple point high above to reach Red Skull #1/5 from the ledge to the left. You’ll see a spike wall below you. Jump down, and use a bomb on one of the alligator enemies while it’s standing up to knock it to its death on the spike wall for that challenge.
Continue jumping across the gaps, using the piston to raise the wooden platforms. On the ledge with the next eye switch, right after you cross the three wooden platforms, hit the switch and place a bomb by it. Wait for the platform on this ledge to drop if it hasn’t, and use the grappling point up to your left to carefully lower yourself down to Red Skull #2/5 before climbing back up. Go in the corner between the spikes the eye switch dropped and the next set, then detonate your bomb to trigger the switch and lower the 2nd set to progress.
Light the torch to raise the next wooden platform below, drop back down, and jump across. Mind the gap… Continue on around the path and up, dealing with the three alligator enemies on pillars to the right. When you reach the room with the two spinning wheels, jump onto the small platform to the left and shoot the eye switch. Light a couple of the vents on the wheel to the left, and once they start lighting the vents on the wheel to the right, shoot the eye switch again so that the wheels shift direction. The wheel to the right will then light the torch, raising a platform so you can get to the upper ledge.
Progress forward until you reach a very large room with shallow water, a long narrow path in the middle, and torches hidden behind spiked walls. Light the torch on the upper-right corner. This will reveal the torch in the left upper corner, so light that next. The spikes will drop around the torch in the lower-right area now, so light that one. A blue platform should be available in the lower-left area. Use
to raise it out of the water, then jump across it and the next platform to reach a small alcove where you’ll find Red Skull #3/5, although it can’t be overtly seen. Just walk back under the overhang to grab it, then jump back across and exit the room across the narrow path.
You’ll see Red Skull #4/5 on a high pillar to the right as soon as you enter the next room. Use a bomb to launch the weight ball across the gap to the left, push it over, and jump onto it to climb up to the skull’s ledge. Place the ball on the switch to start the gas in the torch to the left, and light it to reveal a grappling point on the high ledge above, across the gap, that you can use to get across. In the next room with the honeycomb ball, first use the grappling point to climb up above and circle around to the left. Hit the switch to withdraw the spikes and jump across. Use the staff’s light to destroy the orb, which will lower the spikes blocking the blue platform below.
Push the honeycomb ball onto the blue platform, raise it up, and push it onto the switch on this side. Detonate a bomb next to it to launch it to the other side. It should stop on the far switch, allowing you to jump across. If it doesn’t, just climb down and use the grappling point to get up to it. Push it over onto the round switch, then on into its receptacle to lower the spikes. In the next room you will see three large spinning wheels. Shoot the eye to switch their direction. Jump onto the small platform on the right and light a vent on the right-most wheel, which will light the torch to the right and reveal a grapple point to climb up.
Use a bomb to launch the time bomb out of the water and push it onto the presser plat on the left. Stand on the one on the right, and shoot the eye from up here to switch the wheels’ direction again so that the right wheel lights the middle wheel, then shoot it once more so that the middle lights the left wheel. Finally switch it one more time so that the left wheel spins counter-clockwise and lights the torch on the left. Once all this is done, three pillars will rise out of the water ahead. Before you exit, you need to get Red Skull #5/5 on the lower-left of this room. You’ll need to launch the time bomb down from above, push it down to that area, and launch it over to that platform in order to jump up and get the skull.
Once you get the skull and use the three pillars to exit this room, you’ll get trapped between two spike walls. Light the torches from bottom to top so you don’t get killed by spikes from the ground before you can jump across to the crumbling blocks section. This section has the challenge for stepping on all of the Ammit crumbling blocks. Don’t let this confuse you. You do not have to step on EVERY crumbling block, just the yellow/gold colored ones, of which there are only a handful. So just keep an eye out for them as you run through this section and make sure to touch each one before continuing. If you miss one, just restart the checkpoint. Once you reach the end, grab the last bit of loot and exit the tomb to unlock Burn it with fire.