Mighty No. 9
70 Achievements
1,000
Xbox One
Xbox Series
Heart Attack
Defeated a boss with 1% or less health on Beck.
10
8.46%
How to unlock the Heart Attack achievement in Mighty No. 9 - Definitive Guide
Do it on the City stage and go through as normal. Get the boss close to death then try to only get hit by the bricks that fall from the curling, they do less damage than anything else. Get hit till your on your last hit and finish him off.
This is easily gotten on the City stage boss. Get him down to low health and then run into him until you are very very low. As low as you can get it. Then kill him. The bricks he drops do less damage than running into him so if you need to fine tune your health lower let yourself get hit by those.