Ok Can Someone Explain COOP Mission Unlocking?

I have searched and every thread has different theories as to how and when the coop missions unlock.

Some say via EGO level, but I have coop levels that people say you don't get until EGO 500 yet I am only
EGO 300+

Some say via side missions, yet I have done them and I haven't unlocked them.

Some say via campaign completion, yet I have beaten the main campaign, and nope, don't have them all...

I am missing Scrap works and Island of the Lost Souls (Angel Island).....

How EXACTLY do we unlock them? I want to complete contracts but how can I without the map to complete them? Lol...

My guess it's combination of EGO and main mission unlocks, though I have absolutely no idea.

Mine open up when I complete quests , whether it be episode or story but I havent noticed any when leveling.

Play the Main Mission and Co-Op levels and more will unlock. I had every co-op mission available except Scrapper Salvage before I hit 300 EGO rating and before I finished Act V of the game.

I think I got the Scrapper Salvage mission either after I finished Act V or after I crossed 500 EGO rating... just didn't notice I had a new one available for quite some time.

I don't know. I have one unlocked, and apparently I've unlocked it like thirty times.

The Co-op Missions open as you complete Main-Storyline missions.

I got scrapper Salvage opened when I finished main story and reached ego 600.

Its all about your ego level I'm in second chapter of story but have ego of 700 from contracts pvp I have already gotten trophey for completing all 8 co op maps. You unlock 4 at 400 and the others by level 600

http://oi41.tinypic.com/9rqh6x.jpg..........

Hmm, to be honest, you have multiple ways of unlocking them, the ways are EGO rating, Intel, Data Recorders. Eventually at specific EGO Power Level Increases((You get these threw Pursuits)) You'll unlock them. But also some intel briefts you aquire allow access as well, such as finishing the story mission with the crazy raider, which gives you an intel about 101 Keys, and Dekuso, second I listened to that intel, Explosives 101 opened up. I also found a data recorder, about abductions during my time at Mount Tam, which opened up Finding the lost. the rest due to Ego Power Level Increases.