One you beat all missions in the GDI campaign, you unlock the NOD campaign (though I swear I unlocked it after 5 missions or so. Once you beat the NOD campaign (and the GDI campaign as well, if you havent already), you`ll unlock the Scrin mini-campaign and this achievement.
expressly, How many Scrin missions are there?
The story driven single-player mode of Command & Conquer 3 consists of 38 missions, spread over three campaigns (17 GDI missions, 17 Brotherhood of Nod missions, and 4 Scrin missions).
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