Just some general tips for firefight, not necassarily windward:
1. Play on easy if you have time
2. 3+ people are reccomended but not necassary
3. Get the Gravity hammer, easily the most useful weapon in the game You get about 1000 points for a hammer spree and 2000 for a dream crusher, melee with B and it wont use ammo, after getting dream crusher, throw a grenade and kill an enemy, get 10 hammer kills, rinse and repeat.
4. Shoot the banshees down with plasma pistols, it takes one half charged shot, gives you about 700-900 points, and makes you feel like a beast.
5.On other maps the vehicles can be used for splatter sprees and vehicular manslauters, then shoot 1 enemy and continue.
If you are doing this on easy
6. This should take around an hour on most maps, and you will probably be on set 3.
7.On this map, two friends and I got to 450,000 points, and beat set 5, this took about 3 hours, and I racked up 211,000 points.