Using this method you will easily hit enough points without much effort. Of course go to the shutdown level, legendary difficulty, and turn on the cloud and catch skulls.
From the start of level, get a dmr and a rail gun from off the ship then jump in. Once you take control of the ship start flying towards the right objective on your hud. Once your somewhat close to the right objective, you should see some phantoms spawn up. Once this happens, switch to your laser gun by pressing
. Keep some distance between the phantoms and hit them with your laser gun. Each ship should give you 2000+ points!
Once you acquired your points, watch the video to understand how to speedrun the level. Then replicate it.
*credit goes to Nak3d Eli for the video.