Mortal Kombat
51 Achievements
4-6h
I'm Not Dead Yet!
Comeback with under 10% health in an Online Ranked Match
0.2%
How to unlock the I'm Not Dead Yet! achievement in Mortal Kombat - Definitive Guide
Best way to boost it is to get into a ranked game, and send a PM to the person you're playing against. With much luck, that person will want to boost the achievement with you. At the moment this seems to be the only viable method of boosting, as matchmaking with someone you know in ranked games is next to impossible. Both of you can get the achievement in a single ranked game, you only need to win the round this way, not the match.
Good luck, you'll need it!
In a Ranked Match let your opponent beat you down until you have a tiny portion of health left and then beat them. Try using an X-Ray move as this will deal 1/3 of their life off and will hurry things along.
You can find a boosting partner here.
UNOBTAINABLE DUE TO SERVER CLOSURE
Boostable. You need to win a single round within 10% health or less, AND your opponent needs to have the FULL 100% of his bar.
Follow the instructions provided by HiryuMK:
"... play Ranked Tag since more people play 1v1. One of us counted 3,2,1, Go and search Ranked Tag at the same time".
You can try THIS, thanks to ShadyCaveman.
YouTube - Mortal Kombat / I'm Not Dead Yet! Trophy