This walkthrough will get you all three badges for Shore Siege!
The only things that you buy are:
Make sure no one gets through to your ship you need all the money.
Day 1: Play normally killing all on the screen. Buy nothing
Day 2: Get used to the birds, they will come in handy. Research Artillery
Day 3: Play normal using birds when you can. Repair Ship
Day 4: Play normally. Upgrade Flame
Day 5: Play normally. Repair Ship
Day 6: Use birds on Behemoths when you can. Repair Ship, Upgrade Nail
Day 7: Use birds again. Repair twice
Day 8: Play normally. Repair Ship
Day 9: Play normally. Repair Ship
Day 1o: Play normally. Repair Ship twice
Day 11: Play normally. Repair Ship and you're done.
That is how it's done folks. I even did it witout upgrading the Nail. You can vary things up your way as well. There is quite a bit of lee-way here. Enjoy your 50 points and your Juju card. I did not get the card until my second game after killing about 10 people so just keep on playing for the card.