What are the exact pre-requisites for Helioskrill?

What the title says. I can’t seem to find a solid answer on this. Does it have to be done solo Legendary or can it be done in Co-op? If so, can you mix and match that? I have completed Halo 2 and 4 solo Legendary but am finding it impossible to get through Halo 3 and 1 Legendary. Can I beat Halo 1 and 3 Legendary co-op while having beaten Halo 2 and 4 solo and still unlock Helioskrill?

By unlocking the legend achievement. http://halo.wikia.com/wiki/MJOLNIR_Powered_Assault_Armor/Helioskrill

Well it says complete all campaigns on legendary: http://www.trueachievements.com/a193123/legend-achievement.htm

So I’d assume all levels completed on co-op or all levels solo but I wouldn’t worry about it at moment since certain levels on Halo 2,4 are known to glitch out at the moment or I would have had this near the original release of Halo MCC.

I already have the credit for both Halo 2 and Halo 4 solo Legendary so that won’t be an issue. I hope that someone from 343i can clarify this.

Yes you can mix them, as long as you don’t use the 0x multiplier skulls while doing so.

I find it impossible for H1 and H2. H3 is a piece of cake lol

So is it a yes or no on co-op b/c me and my friend wanna do a co-op campaign

I am pretty sure it is Halos 1-4 solo legendary. If you can beat 2 on legendary, you should be able to beat the rest. Just keep at it.

> 2535428536874523;6:
> So is it a yes or no on co-op b/c me and my friend wanna do a co-op campaign

Please don’t revive very old threads thanks