|Finish all missions with another Player|
Have a second person join before the end of every mission (just press Backspace on keyboard for PC). When you get the score at the end, (medal, time, points, artifacts, etc) Player #1 should be your gamertag and Player #2 should either be another gamertag (360 version) or "Player 2" (PC version). If you have the Combo Bar turned on for the medal achievements, you will easily get over 15,000 points on some missions. Descriptions of the end of each level can be found here.
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