Mighty No. 9
70 Achievements
1,000
Unbreakable
Complete any stage without taking damage.
20
0.08%
How to unlock the Unbreakable achievement in Mighty No. 9 - Definitive Guide
This may seem hard at first, but after you get Battalion's power, several stages become very easy to safely get through if you take everything out from a distance. Just make sure you absorb enemies to get your weapon energy back quickly.
I did it on Power Plant, because I find that to have the easiest level and boss combination. Battalion is useful for most of the level, especially the locking rooms with those pesky bouncing enemies. For the boss, use the Brandish power (sword) and stay behind Dyna, slashing her quickly as she moves across the room. Dash when she's weakened to knock her out of her attacks. When she summons her shield at the halfway point, hold down X before it appears, then jump and release it to quickly destroy the shield. You may have to do it twice. Note that you can destroy her thrown objects with one sword swipe each after they're stuck in the floor/wall. Also, getting hit by one of them does not count as taking damage, so long as you don't end up getting shocked.
If you think another level is easier or you have any questions, feel free to leave a comment.
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.