So far I've managed to achieve maxing out the scores of all Easy level missions except level 14 which I hold #3 leaderboard slot( unless I understand game mechanics incorrectly, this is not possible to max at this time),

Working on normal difficulty, I've got 8 missions maxed. With #40 slot on Arcadia City and #2 slot on Dome of Light without maxing.

I  enjoy this part of the game very much if you haven't noticed.  But I like to share my knowledge of how I accomplished this so others can also share in this fun.  So if you have any questions please ask and I'll provide a detailed strategy. 

(I highly suggest any player looking to max out mission scores complete the game on legendary first)

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GT: DeathKilla09

Uhh con..grad..ulations?

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"Die?"Kurt laughed."Didn't you know?"he told the Elite. "...Spartans never die."

It's not meant as an ego boost thread.  I'm simply pointing out that I am qualified to help people achieve the same things that I have.  If anyone would like help with getting the maximum allowable score for levels on easy or normal(that I have already completed) I would more than willingly give my strategy used.

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GT: DeathKilla09

how do you debuff skull achievement ?

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(c)2010

Activate the skulls from the start menu at the beginning of game(activate only the top skulls that either do nothing to final score or add to final score) and earn a gold medal.  Easiest to do just by going to easy difficulty mission 1. Focus on not losing units, and beating in under 5 minutes.  If you make sure to get all 100 grunts for the optional bonus, you can easily get gold medal with taking more time and losing more units.

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GT: DeathKilla09