Lara Croft and the Temple of Osiris

There are four challenges to complete during the fight with Set:

Defeat Set in under 5:00
Knock 5 enemies into the central pit
Catch 5 enemies in one blast from a beacon
Run between Set's legs at least once

These do not all have to be done at once so I'd suggest attempting these in two separate runs. In the first one don't worry about doing it under 5 minutes, concentrate on getting the other three.

Knock 5 enemies into the central pit:

Do this first before you remove any of the spheres. There will be plenty of enemies around but they won't damage you much if you avoid them. Plant a bomb close to the edge of the pit leaving enough room for enemies to move between the bomb and the edge. Get the enemies to chase you so that they move between the bomb and the pit. Detonate the bomb at the right time and they'll be blown in. Repeat until you have 5. It's best to do this with enemies that haven't taken any damage yet as the bomb blast may kill them otherwise.

Catch 5 enemies in one blast from a beacon:

Use your staff to remove any of the three glowing yellow spheres around the arena. The beacon blast occurs when you light the gas with your torch afterwards. Before you light it, get at least 5 enemies into a group and get them to follow you over to the beacon. When they are all in close proximity of the beacon, light it.

Run between Set's legs at least once:

This can be done at any time during the fight.

Defeat Set in under 5:00:

Now that the other three challenges are done you can concentrate on taking Set down as fast as possible on a separate attempt. Just work on removing the spheres and lighting the beacons as fast as possible. The flamethrower is very good at reducing Set's health bar quickly when he's vulnerable.

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 for completing all of the Tomb of Set challenges. Don't try to do the speedrun with the others, just focus on staying alive when you're trying to knock enemies into the pit. The speedrun is far easier when you aren't trying to do that, although it *is* possible to do everything in one go.


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: Complete in under 5:00; Knock 5 enemies into the central pit; Catch 5 enemies in one blast from a beacon; Run between Set’s legs at least once

Set’s tomb is in the Pyramid of Osiris area. His is the central door at the top of the entry area to the Pyramid of Osiris, and will blast open as you enter the area once tasked with defeating him. Cross over the first bridge and destroy the orb with your light. A 2nd bridge will rise up, and after crossing you’ll see a short scene where a giant alligator shows up. Shine your light through the orb here then light the beacon before he can relight the orb with his flame breath. It will explode and the shockwave get rid of the alligator.

Set appears on the next platform, which has the central pit for the ‘knock 5 enemies’ challenge, so make sure to do that while you’re fighting here. You must set a bomb a little bit away from the pit, then lure enemies around it and run over near the bomb so they hug the pit as they come around. Detonate the bomb just as they reach it to knock them in. It takes a little trial and error. To get the ‘catch 5 enemies’ challenge, lure the first group of skeletons over to one of the orbs and shine your light through it to get rid of it, then step where it was and a blue shockwave will be released. If you catch 5 enemies in it you’ll take care of that challenge. Also run between Set’s legs at the first opportunity. You can just replay the fight for the speedrun challenge.

You have to get rid of all three orbs and activate the blue beacon so that the big blue ghost (Osiris) moves to the middle and holds Set in a blue beam of energy. Then stand in one of the blue flames and shoot from it to damage Set. Deal with a few adds after the damage phase ends and the orbs reappear, then get rid of the orbs and light the beacons again. Barrel-role around with to ignore any straggler adds so you can focus on the orbs. You have to be quick when clearing the 3 orbs and lighting the beacons, as they’re on a timer once you get rid of them.

If you take too long to get to the 3rd orb and get light its beacon, one of the others may have already turned back into the orb, preventing your chance at the damage phase and forcing you to go back and deal with it. So to ensure as long a damage phase as possible, and a successful speedrun, make sure you clear all three orbs fast. Rinse and repeat, damaging him when Osiris is in the center holding him, and soon enough you’ll knock out this rather easy tomb and unlock Bad…doggy. If you get all the challenges done you’ll get All bark and… as well.