This achievement can be slightly difficult to do with an AI opponent. The way to get this achievement in the first place is to lose a single fight (not an entire set of rounds) without awakening. This means dying by taking more than 35% of your remaining health (as you awaken at 35%) OR you get insta-killed by a final fatal attack (D,D,D+CD in a fight where the person doing the move would win the whole match and they have 100SP) before you have awakened.
An easy way to get this achievement is online if you get beaten by the latter (either by someone who knows what they are doing and takes the time to do a final fatal move or by a friend whom you collaborate with).
The other more difficult way if online is not working for you is to get your butt handed to you in arcade mode by the A.I. I have yet to have the A.I. do a final fatal, but both my wife and I got this on accident while fighting Mitsuru (usually round 7) and she used her awakend Mabufala on us (which does ALOT of dmg). Just get her to an awakened state and when she has 50SP (which she should easily have) stay in melee range of her and she will use the move (frequently I might add). I've had her use it as many times as she was able in one match as long as she had the SP for it. All you really have to do is manage your health well enough for you not to awaken while you wait for her to use it. It is semi and anti-air attack so if you jump in her direction when you are ready for the move, it might go the extra mile to provoke the attack from her. She's at a high enough round in arcade that she's got a fairly intelligent A.I. so these attacks are fairly expected and predictable from her.
As I mentioned, this 2nd method CAN take a bit more work than the 1st method, but as I also mentioned both my wife and myself got this achievement purely by accident on her. And she has killed us with the move before awakening since then. Good luck and if anyone else has tips or wants to vote negative, please add in the comments section!