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Halo 4: Complete Infinity.

1 guideOnline/OfflineSingle PlayerCooperativeMain Storyline
Strategy OneStrategy One664,622
23 Nov 2014 10 Dec 2014
16 2 6

To obtain this achievement you must finish the mission Infinity on any difficulty which is the 4th mission on Halo 4. If you play the game or halo 4 from beginning to end you will unlock this achievement as it isn't missable.

Note: The mission achievements have been really bugged so if your achievement says "Done.... Unlocking" your in the same boat as basically every gamer. I still have 1 mission achievement unlocked a week and a half ago and it still says "Done.... Unlocking" don't keep attempting to unlock it because it won't happen. Just pray Microsoft or 343 (whoever has to fix this will) which with the amount of people its affecting, I can assure you something will be done.

Update 12/09/2014: Seems as though they fixed all level achievements, either it will unlock on you randomly (some say) or you can definitely unlock it by replaying the level. It won't unlock immediately, but at a random time, most likely you will have it in 24 hours.
CanadianWhizKidWell, I know Bungie definitely won't be fixing it...
Posted by CanadianWhizKid on 24 Nov 14 at 04:10
Strategy OneI don't know if its Bungies problem. It could be Microsofts fault for them being bugged like this. I would guess so at least.
Posted by Strategy One on 24 Nov 14 at 04:59
BugogiThis achievement wont pop for me, ive finished it now multiple times and completed the level reclaimer after it and it did pop. Its been a couple of days now, any suggestions?
Posted by Bugogi on 25 Oct 15 at 16:51
Strategy OneCheck to see if it says "Done Unlocking"
Posted by Strategy One on 25 Oct 15 at 16:54
Epsilon FactorI just beat this level and got no achievement. It doesn't say Done Unlocking either!cry
Posted by Epsilon Factor on 03 Nov 15 at 01:51
D2C KittyFluffyAnd now 2019,still buggy, Great, which it's unlock soon for me.
Posted by D2C KittyFluffy on 04 Aug 19 at 15:34