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I just beat the game today with a coop-partner on hard (second run, first run was solo with all collectables).
Now this achievement is all there is missing for a complete game. Well, what exactly do I have to do?
I have to finish 5 different levels with different coop-partners. But do I really have to be the host always? Or is it sufficient to jump into different games and finish a level and repeat until I got the achievement?
It seems to take ages to wait for a partner to join my game...
You have to host and you have to play on five different levels with the five gamers. So basically get someone to play level one with you, end the game, get someone to play level two with you and end the game, etc. etc.
Playing: Dragon Age 2, Space Hulk (Saturn), Dead Space 2