The achievement should it work if i repeat missions in legendary with all skulls active? or do I have to make a new game? However, I find it absurd not to be able to view completion time and other statistics of the single mission
let me know if its work! Are you only using missions replay? or did you restart a new game file?
Mission replays on my existing LASO profile. If it doesnāt progress, then Iāll have to make a new save. Although, thereās nothing been said thatās required.
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all right lemme know if it pops when you finish the game.
Thxxx
The progress bar hasnāt changed, despite playing beyond where Iād gotten up to. Iām just going to start a new save, because Iām not going to go through to the end, only to find out it hasnāt been tracking again.
Mission replay is a bust for LASO, it seems.
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Iām pretty sure the achievements donāt track anymore by design. Whatever progress you were at when they stopped tracking is whatāll show until itās unlocked. I thought about trying mission replay myself. I hope you donāt have to start fresh for it to count. Anyway, if you continue with mission replay, pls keep us up to date.
Mm, I was told similar elsewhere. I might just go through from the start again though, as to get all the other new achievements while doing LASO.
Iāll update on progress either way.
Do it coop with 4 people if you can. Itāll make the run faster if nothing else.
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I did the entire lasso campaign for the 5th time now I think, this time was after the winter update. Iām still stuck at 82%. Whatever the case is, 343 I deserve my achievement at this point. Iāve done it with the tank gun. Iāve done it without the tank gun, Iāve replayed every single mission, every single skull on, on legendary, EVERYTHING. Please just give me the achievement at this point. Iām not doing it again at least for awhile. To anybody looking for help good luck, I really hope it works for you. Lmk how you got it to work. 
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I have completed LASO through the mission replay, yet one mission āThe Sequenceā doesnāt track.
So, Im not sure if the achievement it obtainable through this methodā¦ Kinda sucks, all the other missions show legendary level difficultyā¦
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Iāve also done this (replayed all missions, in order, via Mission Replay) and like you the achievement still didnāt unlock. However, my very first playthrough of the campaign collecting the skulls (and everything else to 100%) was on Legendary so canāt check if any specific missions didnāt update. 
That said, the latest reply from 343 to my bug report on the achievement not unlocking from before the Winter Update specifically says to replay all missions, in order, via Mission Replayā¦ So itās supposed to be obtainable through Mission Replay, but no such luck for me so far. Itās also an interesting response to get since my last message to them, that they were replying to, said I had just done that so really helpful replyā¦ 
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Oh wellā¦ yeah also had a support ticket open.
Remember, using glitches or tricks (including but not limited to mission and objective skips) may not mark missions as completed for the Achievement.
What arrogance, that was in my initial ticket description, I didnāt use any glitch or skip at all 
Using Mission Replay via the TacMap, replay all main Campaign missions in order and ensure all 12 Skulls are enabled. After completing each mission, use the TacMap menu to verify whether the mission was completed on Legendary. For reference the missions are:
Oh, and how should I verify? All missions are already marked as completed in legendary ā¦ there is no indicator for the ASO condition of LASO (was that so hard to add after all the frustration you caused for your players, at least this??)ā¦ replayed the first two missions, they look completely as before?
If the Headmaster Achievement does not immediately unlock upon completing all 15 missions with LASO conditions enabled, try returning to the main menu then loading back into the save file. Once in game play, play normally for several minutes (navigating through the world, fighting enemies) to see if the Achievement unlocks. Please lets us know if after following these steps the achievement is still not unlocking.
LOLā¦ my save in the startup screen never keeps skulls or sometimes even legendary, but for whatever reason resets to heroic. Also my save doesnāt keep me āin the missions replyā, is this normal? Besides the other reports here and elsewhere, and this strangenesses, and then the sentence "Please lets us know if after following these steps the achievement is still not unlocking. " sounds completely as if they are only 10% sure this should work now. This must be a joke. On the other hand I understand, you cannot test this well because it is a massive time investment, just let your customers waste their time and play guinea pig forever?
This is beyond laughabilityā¦ how can 343 after already 4 months of waiting for a once working achievement, how can they put up the sure one of the most time intensive achievements up so unreliable? Microsoft either should force them to fix this immediately, or if they are incapable, remove it. Every time I get the advertisement for this achievement on some idle XBox screen is mocking ā¦ this is not how you treat your customers
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My savefile bounces back to heroic for some reason too, It could be a problem with āThe Sequence" mission as in my case.
And hey, at least they answered to your ticket, but indeed a very poor/ unhelpful answer that itā¦
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Iāve been stuck at 82% for a year. Tried going back to individual levels since they finally added mission replay. But the achievment is just straight up broken.
This type of bug a year past launch is just embarrassing
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So, after reading all through this thread, I decided to start a clean save for another LASO run. I just finished āthe spireā, and am on Pelican Down. I just back through all the missions, and theyāre all showing cleared on legendaryā¦except the spire. That one is showing cleared on āeasyā for some reason.
Is that normal, or is this save bugged too? Not sure if I should continue, or go back and try to āreplayā the spire to see if it registers the legendary clearanceā¦
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Its bugged seems like, I still have āThe Sequenceā on normal no matter how many times I replay it on LASO.
Submitted a ticket a while ago too, but seems like 343 donāt care at allā¦
The campaign is broken, just wait 2-3 more years before playing it again to get achievements. The Sequence is still stuck on mine as well
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Well, I replayed the spire just to seeā¦and it updated as legendary. Did the pelican down mission and it updated as legendary as wellā¦.so weāll see.
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Let us know if you secure the achievement man
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Instead of doing mission replay, has anyone tried to 4 player co-op rush this with the tank gun?