Hi, so, i finished the Halo 2 Legendary Campaign in 2h 56min 34sec (Gravemind taking 44min smh) and i had the two achievements for copleting the game on Leg. and Heroic, but not under 3h… I have done all missions in Coop, except Gravemind [never finished with my duo] and Regret [ did it in duo but it took 13:38 when my solo time is 13:00]. I’ve already hard-reset my Xbox, watched each of my times, re calculated every time, but im still below 3h and i still dont have my 0.02% achievement, i remember it took few minutes for the same achievement to pop on Halo CE but now it is a bit too long so im worried i have to do allmisssions solo legendary to have times everywhere… halp
EDIT: I have done all missions in solo Legendary, i somehow managed to beat time on most of them anyway but my total is 3h 30min so above 3h, BUT i still got the achievements, which means having a random time saved on both Solo and Coop helps syncing the overall time. Good Luck to anyone attempting it, and remember, DESPAWNS ARE OP
It’s looking like completing them on solo Legendary might be the only possible way for you to get the achievement now unfortunately. Co-op play on MCC in general is very buggy, and a lot of people have issues with certain achievements being unlocked. If you complete the levels solo, I wanna say 9 times out of 10 they should track properly in-game and here on Waypoint. Sorry 
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> It’s looking like completing them on solo Legendary might be the only possible way for you to get the achievement now unfortunately. Co-op play on MCC in general is very buggy, and a lot of people have issues with certain achievements being unlocked. If you complete the levels solo, I wanna say 9 times out of 10 they should track properly in-game and here on Waypoint. Sorry
WELP, i was expecting that, i had the time to finish 3 missions in an hour yesterday, hopefully thecampaign on lgendary isnt that hard
I mean in my opinion and the opinions of many others, campaigns from hardest to easiest on Legendary would be 2 by far, then CE, 4, 3, and ODST. Speed running makes it even spicier though since you gotta make sure you hit most, if not all the skips and tricks lol. However, a rather “corny” tactic to cheat your speed runs is any time you die or mess up a certain part and want or need to redo it, you can exit the game to the dashboard, quit MCC, and then reopen it. When you load up your campaign again, you’ll be at your last checkpoint without any extra time added.
well, my first Halo Campaign experience was a motnh and a half ago, back then i knew nothing about how to kill elites, they seemed like they had 100000000000HP to me, ut i still wanted to grind the MCC, now ive done the Halo CE campagin under 3h, with all times, alll scores, all skulls, all secret achievements and mission related achievements, same thing with Halo 2, now im moving on to H3, will be fn i guess, i just need those campaigns and i will have all the MCC achievements in less than 3 months, my goal.