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Devastating

Halo 3: Complete all Halo 3 Legendary campaign missions in under 3 hours.

Devastating-2.4
3 guidesOnline/OfflineSingle PlayerCooperativeDifficulty SpecificTime/Date
count023count023592,737
25 Nov 2014 14 Dec 2014
21 4 35
Named for DarkDEVASTAT10N who appears to hold the WR of 1:30 or so for the achievement:

Not much I can offer on the speedrun subject except to learn the tricks on easier difficulties and then try to apply them on the harder ones. Do not be afraid to abuse the hell out of the save/quit exploit. (save and quit if and when you die/botch an event, then resume at last checkpoint from the menu)

As per the other speedrun achievements, the 3 hours is merely a cumulative account for your best scores in the H3 Campaign on legendary difficulty so it doesn't have to be completed in one sitting. HOWEVER, you MUST complete the campaign in either solo OR co op completely for the achievement to unlock. It will not unlock if you have a mix of solo and co op levels completed.

A thing of note, like the Par Scores for 3 and 4, the save & quit exploit does NOT reset your time at the last checkpoint, only your score and death count.

As of 7/12/2014, some people are now able to unlock this achievement but a lot of people are still reporting problems.
is that HydroGlitch - Confirmed (2:39:52 no chevo) ... You are also correct - Does not have to be in one sitting.
Posted by is that Hydro on 26 Nov 14 at 14:09
All Hail Elmo2:45:36 no cheevo for me or my partner. F**k this man...
Posted by All Hail Elmo on 30 Nov 14 at 20:59
VestrideDid it all solo. Still glitched as of December 1st.
Posted by Vestride on 01 Dec 14 at 08:21
AStarfox170 Mins completion. No achievement 01/12/2014. cry
Posted by AStarfox on 01 Dec 14 at 20:46
n4k3dLEEI can confirm that todays update has fixed the speed run achievements.

If you've already met the requirements, this achievement will unlock in the main menu.
Posted by n4k3dLEE on 08 Dec 14 at 08:04
LAFTAHasn't unlocked for me still and I have done it.
Posted by LAFTA on 08 Dec 14 at 10:06
TugokSame here, LAFTA. "Monopolized" unlocked after the update, but not this one.
Posted by Tugok on 08 Dec 14 at 11:43
n4k3dLEEOh right, sorry it's not working for you guys. I've heard a few people have got it by going into the Halo 3 menus but if that doesn't work then maybe try watching the Epilogue to see if that triggers it.
Posted by n4k3dLEE on 08 Dec 14 at 13:29
HelplessFruitSadly mine is still locked cry, tried watching the epilogue in legendary to try and trigger it but that had no luck either, hopefully mine will just randomly unlock at some point lol
Posted by HelplessFruit on 08 Dec 14 at 15:43
LAFTAMine is a mix of solo and co-op, does it have to be one or the other?
Posted by LAFTA on 09 Dec 14 at 00:18
TugokI watched the epilogue and then watched "Arrival" and the achievement popped! Actually, I didn't even "watch" them at all. Just started them up and skipped them.
Posted by Tugok on 09 Dec 14 at 02:24
TugokA mix of solo and co-op shouldn't matter, LAFTA.
Posted by Tugok on 09 Dec 14 at 02:26
SmiththedudeDoes the checkpoint exploit still work? Every time I save and quit, and resume, and the clock just picks right back up at the time I was at when I quit :/
Posted by Smiththedude on 09 Dec 14 at 04:08
count023the time exploit never worked in 3 or 4, only in CEA and 2. In 3 and 4, same with par score/par time, the timer will continue.
Posted by count023 on 09 Dec 14 at 06:22
LAFTAThanks tug, I tried arrival. I'll give the epilogue a shot.
Posted by LAFTA on 09 Dec 14 at 09:14
LAFTANo good, just went back and improved my Tsavo time. Still nothing, awesome.
Posted by LAFTA on 09 Dec 14 at 14:50
ResinousHashishHalo 3 Legendary Playlist / (4) Player COOP / (1) Sitting

Completed In 1 Hour 58 Minutes & 16 Seconds

Achievements Popped!
Posted by ResinousHashish on 09 Dec 14 at 17:05
BugattiMyJacketI can confirm that Solo and Co-op legendary completion DOES have something to do with it not popping. I ran through with 3 other guys and they all popped it. I looked at my campaign and saw that I had all but the Epilogue completed on Legendary in co-op. I tried watching Solo, nothing popped. I added my 2nd controller in for co-op and watched and it popped right after it was over.
Posted by BugattiMyJacket on 10 Dec 14 at 04:23
TachikomaShikiI also had done all missions on Legendary in Co op and a few in Solo. My friend who had hosted them, got the achievement but I didn't. After looking through my missions again today, I noticed that Crow's Nest and Tsavo Highway said the highest difficulty I had done them on in Co op was Normal??? I replayed those two again in Co op on Legendary and it unlocked on the results screen at the end of Tsavo Highway. So if it doesn't unlock for you, check each mission and make sure you have them all done in either Solo or Co op, not a mix. I expect this will probably be fixed in a future update anyway.
Posted by TachikomaShiki on 10 Dec 14 at 19:54
ElateDragon9294Does the save and quit exploit work? My time just keeps going up.
Posted by ElateDragon9294 on 13 Dec 14 at 23:41
District PieI've completed H3 under 3 hours and replayed a mission but the achievement isn't unlocking? Any suggestions? Thanks
Posted by District Pie on 22 Dec 14 at 19:50
Shadow 00 FoxDoes your profile on halowaypoint.com show your times under 3 hours? I personally made some math errors when I thought mine should've unlocked....
Posted by Shadow 00 Fox on 25 Dec 14 at 06:07
BrokenKnghtCan anyone confirm that coop and solo times count? Right now i'm roughly 30 minutes over the 3 hour mark (doing it all coop), and I want to run back through solo and try and whittle that down. However I don't want to waste my time if my solo times won't count.
Posted by BrokenKnght on 06 Jan 15 at 13:36
paddycfc22I think me and my mates accidentally found a glitch on the time. So wee completed the game on legendary and had to go back to about 3 mission due to being about 40mins over the 3hr time. So wee loaded up covenant mission and there was 3 of us,but the game was soooo laggy and it must have been about 5mins in then wee host migrated and game ended. It gave us the short time and then wee loaded up the ark sane thin happened and then wee got the achieve. Pretty weird.
Posted by paddycfc22 on 06 Jan 15 at 17:28
paddycfc22Not sure if it will work for everyone but wee all got it due to host migration
Posted by paddycfc22 on 06 Jan 15 at 17:29
SchiZoPHreNiikzStill not popping for me :(
I finished everything in like 2:41.52s
Posted by SchiZoPHreNiikz on 06 Jan 15 at 17:39
HurballCompleted this with me as Host with one player splitscreen on my console and another player on another Xbone. Achievement popped for me, and we all have the same times displayed on the leaderboards, yet the other two players didn't get the achievement.

343's incredible coding strikes again.
Posted by Hurball on 17 Jan 15 at 20:17
Strategy One"It will not unlock if you have a mix of solo and co op levels completed." im more than sure this is incorrect, though if you want to easily get this achievement do the whole campaign in Co-op. But if its mixed you merely have to have every mission complete solo legendary, so the missions that you have a amazing co-op time, make sure to at least finish it solo too.
Posted by Strategy One on 29 Jan 15 at 06:44
DiZ30We just did it and it popped for the host and not for the other 3, we just had the other people host a new game and just play the epilogue and it popped for each of them when they hosted it.
Posted by DiZ30 on 08 Jun 15 at 03:45
UnfurledEmu75I found that the save-quit method works, but you cant "save", you have to exit to dashboard and close the game. And again, doing this in the final checkpoint will null the time and score.
Combining this with saving in the cloud shoulnt be too hard.
Posted by UnfurledEmu75 on 07 Jul 18 at 11:36
count023Dashboarding does work, but it still adds to the in game timer. So it is generally advised to avoid it where possible as you can re-do the same segment 100 times and have blown 40 minutes of the clock on a single checkpoint.

That's what "A thing of note, like the Par Scores for 3 and 4, the save & quit exploit does NOT reset your time at the last checkpoint, only your score and death count." this part of the guide referenced as the "save & quit exploit".
Posted by count023 on 07 Jul 18 at 12:52
UnfurledEmu75Exiting to dashboard will keep the time and the score you had on the last checkpoint, even if you die multiple times after. (I mean, when you die or load it appears "checkpoint... done" but that doesnt seems to count as a checkpoint) It just works like halo 2, but you cant hit the save-quit button.
I got the achievement today using this method. It works on all levels, however on "the covenant" you cant quit on the final room even if you got many checkpoints throught.
Posted by UnfurledEmu75 on 09 Jul 18 at 12:51
Apache117XThis is still bugged, me and my buddies did it with 20 minuets to spare, no achieves for anyone.
Posted by Apache117X on 12 Apr at 11:22