First of all, wrong forum.

To unlock parts in:
Cell: Defeat other cells that have a part you don't
Creature: Dig in bones
Tribal: Defeat/ally other tribes
GA: Get your captain promoted

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I understand your problem. Okay, first off, you need to up the defences of your cities, such as adding more cities and adding more turrets. This takes care of most minor attacks, Next, you need to start placing uber turrets. Uber Turrets are expensive but they can eliminate most attacks, excluding Grox attacks. As for Grox attacks, you'll (sadly) need to take part in those, as they have the most HP and highest attack power. Oh yeah, make sure you bring allied ships along, or the Grox will reduce you and your ship to small bite-sized pieces without even trying.

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