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Complete any stage without taking damage.

This does not stack with Invincible No. 9. Which means you have to do any stage OTHER than the City stage to earn this.

I did this on the Power Plant stage. I used Battalion almost exclusively on the level to destroy everything before I got there. I only dashed through enemies I knew it was safe to dash at. Some enemies stop moving once you stun them, some will still attack. On the ones that would still attack I would just shoot another Battalion to destroy them. The parts where you have to fight the waves of small enemies are easy to beat once you understand the pattern. Battalion will stun every enemy in that level with one shot. The only tricky part is the instant kill generators, but you have to learn how to get past those anyway. If you die at them you just gotta restart.

The boss is tricky to beat without taking damage but not impossible. Refer to "Super Boss Killer" for tips on how to beat her.