Halo 4

Pretty self explanatory. Play Spartan Ops on any difficulty. You can do this solo or co-op, or a combination of the two.

If, for whatever reason, the achievement doesn't unlock after the 5th mission, simply play an episode of Spartan Ops on ANY level, any difficulty, solo, and it should unlock.

Not really a solution but a statement and general advice on how to go about unlocking this achievement AFTER the Jan, 13 Halo 4 online server closures.

One thing to note is they erased my previous stat tracking and erased all played Spartan Ops Episodes/Missions. I have heard others experienced the same.

I played all 25 original missions in order on casual in one sitting and that took 5-6 hours to do. I didn't want to play and stop due to the current glitch issues people are experiencing. I didn't want to risk not being able to obtain the achievement. It could go quicker depending on if your brain doesn't melt doing the same thing over and over on the same 3 maps for that amount of time.

There is no specific detail run through method because on casual it's a breeze even solo just time consuming. Use the guns you have and occasionally restocking on ammo with the ammo crates laying around the map. Do grab power weapons for bigger enemies, use Ghost to smash into groups and it's unlimited blaster to mow enemies down.

Originally I was going to do it on the Xbox 360 but it wouldn't let me join the Spartan Ops game or search for Spartan Ops Co-op. Testing it on the XONE backwards compatibility, it did allow me to play solo or in Co-op but no one was found during my attempt. Another thing to note about the cloud save, it took over 5 minutes for it to pull. Hopefully no one runs into issues with it. Maybe others can test Xbox 360 Spartan Ops but after completing on the XONE, I did not go back to check Xbox 360. I was just glad to be done with the grind.

Good luck to all and fingers crossed glitches don't hold your completion back 👍

Just adding a guide for anyone doing this before December 18, 2021. The achievement very well may be unobtainable after then.

For this achievement, you need to play a total of 25 spartan ops missions across 5 episodes. I'm not certain if they have to be done consecutively, in order etc. Because of this I recommend you start at chapter 1 episode 1, and go from there, not skipping any missions. YOU CAN DO THIS ON EASY! Estimated time for completion on solo - easy - episode 1-5, was 6 hours.

This is in no way a hard achievement, but it is very time consuming sadly :(