Extra Credit

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Complete 75 challenges

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Each of the thirty missions in the Single Player Campaign has three specific Assault Ops, or challenges, that must be completed for this achievement. That would mean there are a grand total of ninety challenges to be done, so as Im sure you guessed, this is where most of your time on the game will be spent.

These challenges are very grindy, and most of them arent even difficulty. They are simply tedious and annoying. They range from, Kill x amount of Drones with a Plasma Pistol to Destroy x amount of Wraiths with a Grizzly Tank. Overall, youll need to grind all of them out and take note, that if you complete an Assault Op mid-mission, you can quit out of the mission and your progress will still be saved.