Flooded

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Complete all co-op missions

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There are only a total of five Co-Op missions in Halo: Spartan Assault. Unlike the Single Player missions where all you have to do is get from Point A to Point B while killing everything in your path, the Co-Op missions are designed for, as you may have guessed, nice cooperative and tactical combat and gameplay as you may need to hold and defend a Forerunner structure for five minutes, or strategically work together to shut down an entire Forerunner facility by destroying its fusion cores. This achievement shouldnt pose as too much trouble, but be ready for missions three and five, as those are the harder of the bunch. The achievement will unlock once all five missions have been successfully completed.