Comments on the guide for Headmaster in Halo Infinite by Kexol

If you are focused on getting LASO and the speed run in under eight hours achievement - this guide is for you.

Collect All The Skulls
Firstly, you will need to play through the game once and gather all the skulls. I would highly suggest playing through on easy/normal, enjoy the story and gather all the collectibles (most importantly the skulls!) in the game before focusing on these achievements.

For all the collectibles that are missable:

For all the collectibles that can be achieved at any time:

Any collectibles collected will carry over to your next playthrough. If you miss any collectibles, you will need to replay the campaign from the beginning and make your way to the designated mission.

LASO and Speed Run Guide
Once you have played through the game once and collected all the skulls, you will need to start a new game on legendary with all 12 skulls enabled. If you decide to quit your game during the run, make sure you load your game instead of pressing continue. This will ensure your campaign progress is retained.

If you want to get this achievement in the fastest time possible, I would highly suggest using the video guide provided below. I was able to beat the LASO campaign with 2:30:00 on my save profile - which is almost six hours under the eight-hour time limit! Be aware, this video guide involves glitches and skips!

While this guide is great, there are a few alternatives/tips from my experience that will make this a lot easier for you:

00:00 - 21:40 - I didn't use the guide up until 21:40. However, I would highly suggest following along. You will probably finish your LASO run much faster than I did.

36:15 - You can opt to search for spartan cores around the map. You have plenty of time to look for them so don't feel pressured. If you want to make your run slightly easier, I would try getting additional spartan cores to upgrade your shields. Just make sure your able to get the fourth upgrade for the grapple. Don't worry about any of the other upgrades.

40:13 - Super easy and reliable to do this method for the road skip - just takes a little more time. I would suggest doing this than the method at 37:39.

43:27 - You don't need to do this glitch. You can just as easily get through these rooms with a little bit of patience. Use the left entrance ramp as cover in both the basic and advanced training room.

49:20 - You can stay up on the hexagon pillar and shoot at the enemies from afar. Its relatively safe. Just make sure to kill any enemies underneath you so they can't throw grenades at you.

51:45 - You don't need to grapple around the room and shoot the hunters. You can sit behind the large glass wall in the room. Focus fire on one of them, then work on killing the other hunter.

52:50 - You can take your time and take out the enemies in the room then melee the grunts at the end to get a checkpoint. There's no need to try to skip it.

53:15 - You don't have to grapple across these rooms. You can take out the enemies in both these rooms. Won't take you long.

1:08:35 - I was unable to enter the northwest beacon after clearing out all the enemies due to a glitch that happened multiple times. Don't worry, if you cleared out the area and you can't activate the door to the beacon. You will have to leave the area and respawn the enemies. You will have to clear out the area again until it works.

Your eight-hour speed run achievement will unlock after you finish the Silent Auditorium level. The LASO achievement will unlock for you after you complete the Sequence mission.

I will update this guide if changes are made to the campaign in the future. If you have any questions or concerns, please feel free to comment down below. Godspeed Spartan!