This achievement is a hidden ending to Kamille's campaign in Official mode.
This strictly involves mission 8, so if you've already played through his campaign, simply start that mission again and do what is needed. A couple of big notes here, play on Easy so you can kill fast and use Zeta Gundam with its transformation. The requirements will force you to travel long distances quickly so you'll need every edge you can get speed wise.
In simple terms, you need to win this mission without any friendly pilots (or battleships) getting shot down and succeeding with colony laser firing. Because several deaths are scripted, it is actually fairly complicated.
As soon as the battle starts, make a mad dash to the far east side of the map. You must defeat Yazan protecting Emma before the event is triggered where the battleship sacrifices itself to save her. After this, make a mad dash back to the Argama and fight off Yazan's 2 wingmates who should be attacking it by this point.
Shortly, Reccoa will appear near the South East corner of the map and Emma will appear there. You must rush there and defeat Reccoa before they manage to destroy each other. After this, rush back to the Argama again and defeat Yazan who should be attacking it.
By this point, the colony laser should be charging and Scirocco should be on his way to it with Haman on his heels. Head there quickly and defeat both.
After the colony laser fires, head to the center of the map and stay near Quattro. Haman will appear there and, because of the way you've been forced to play the map, Quattro will not be able to hold out against her very long. Defeat her and her forces will retreat and Quattro will return to the Argama where he will be safe.
Emma will still be around and you will have to take care of Sciroco before her health runs out. Quickly head to the enemy field in the North East, defeat enough enemies to pull him out, and finally defeat him to end the mission.
If everything was done correctly, the achievement should unlock just after saving during the mission results screen. Interestingly enough, this is actually before watching the video mentioned in the description not after as it alludes to, but I suppose it is close enough.