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A Monument To All Your Sins

Halo: Reach: Complete every level of the game on Legendary difficulty, by yourself.

A Monument To All Your Sins-1.3
3 guides
05 Dec 2019 10 Dec 2019 22 Dec 2019
12 1 3
I've made a new solo legendary vid for TMCC, with data pad locations pointed out (usually just via text), misc achievement reminders (like the easter egg ones), and tips here and there. It is designed to be approachable so there are no crazy speedrunner skips or despawns except for the gate glitch on Nightfall since it's easy. Some parts are sped up for brevity but it shows more or less my path through the game.

OR if you wanna take the easy route, see my LASO solution. Save/quit at the end of each mission then load up the non-modded PC version or XB1 version to complete the mission for credit.
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ShonicTH Heads up, this achievement appears to be glitched for me, using the unmodded method. Occasionally, after beating a level legit, the game will not count it as having been beat on Legendary, and under Career it won't show the number of missions needed for the achievement as going up. I'm unsure if this will mess with actually getting the achievement(if it uses a different method of tracking), but my gut feeling is that you'll need to replay the level over again.
Posted by ShonicTH on 14 Dec 19 at 17:59
melbufrauma @ShonicTH yeah I have had to replay several levels 2-3 times before it finally registers my save during missions end CS.
Posted by melbufrauma on 17 Dec 19 at 07:17
Maverick Hiro I've done it with no mods through the Legendary playlist (so to get 1 out of the 3 required) and every mission counted and had it's achievement unlock with no issues.

But i do remember that in past MCC titles, if you saved and quit on the very last loaded portion of the mission (ex: the fight against Prophet of Regret) and loaded it again, the timer would freak out and the mission wouldn't count. I don't know if this was patched but maybe it's the same with Reach?
Posted by Maverick Hiro on 19 Dec 19 at 20:21