Dead or Alive 5

Obviously you have to complete every command training list for every character, which is located under: Main Menu > Fight > Training > Solo > pick a character and stage > press start and then 'begin command training' and follow the list of inputs!

Whether you're going through Command Training to learn a character, unlock their System Voice (no System Voice for Akira, Sarah, Pai, and Alpha-152, BTW), unlock their "Training" title, or earn the Exercise Newbie achievement/trophy, also DON'T accept any throwdown challenges while working on the list as it doens't remember where you left of and you have to start from scratch ..I hope this helps!

Here is a list I found while looking for all characters Command Training: a list of "with", "during", and "while" moves and stances

Some of the moves in Command Training have prerequisites (things you have to do before you do the move), but annoyingly, the Move Lists don't tell you how to do all of these (some of them can be found in the "Special Moves" section (and sometimes other sections), but not all of them).

So here's a list of the moves that are the easiest to pull off/minimal input for the stance. There are other ways of doing a lot of them, but these are the easiest.

BUTTON INPUT:
- u, d, f, b, = up, down, forward, back (combined like df = downforward, bu = backwards up, etc etc)
- H, P, K = Hold, Punch, Kick


All characters:
To get back to default stance (standing, facing opponent): hold H
While sidestepping: u,u or d,d
While running: from 1 or more body lengths away, f,f(hold)

Akira:
(no special prerequisites)

Alpha-152:
Juggling opponent: ub+P
(That should've been called "While floating" instead of "Juggling opponent")

Ayane:
With back to foe: u+P

Bass:
With back to foe: f+P+K

Bayman:
With back to foe: d,db,b+P

Brad Wong:
With back to foe: b,b+P
Lying with legs facing foe: d+P+K
While lying: same as "Lying with legs facing foe" (or do "Lying with head facing foe" and f/b reverse the command)
During Dokuritsu-Ho: b+K
Lying with head facing foe: df+P+K
During handstand: f,f+P+K
During reverse handstand: b,b+P then f,f+P+K

Brad Wong's "Lying with head facing foe" changed to the much easier "df+P+K". Thanks to GeneReaver for pointing that out. I'm not sure how I missed that in his Move List when I was taking notes on Brad! :-P

Christie:
With back to foe: b+P
During Jakeiho: u+P+K or d+P+K

Eliot:
With back to foe: b+P

Gen Fu:
With back to foe: b,b+P (miss with this move, or opponent will end up in front)

Hayabusa:
With back to foe: df+P+K
During Ongyoin: d+P+K

Hayate:
With back to foe: u+P

Helena:
With back to foe: b+P
During Bokuho: d+P+K

Hitomi:
With back to foe: b+H+K

Jann Lee:
With back to foe: b,b+P
During Dragon Stance: f+P,b

Kasumi:
With back to foe: b+K
During Hoshinpo: df+P+K

Kokoro:
With back to foe: db+K

Leifang:
With back to foe: b+P
During Unshu: b+P+K

Lisa:
With back to foe: u+P

Mila:
(no special prerequisites)

Pai:
With back to foe: b,b+P
During Bokutai: b+K,d
During Meishouho: b+P+K
During Hakkeshou: f+P+K,uf+P+K

Rig:
With back to foe: b,b+K
During Bending Stance: b+P+K
In Turn Leg Cut: f+P+K

Sarah:
With back to foe: b,b+P
In Flamingo Stance: b+K
While stepping: b+K then db+P+K
While stepping forward: f,f+P+K

Tina:
With back to foe: b,b+P

Zack:
With back to foe: b,b+K
While Ducking: d+P+K
While Swaying: b+P

NOTE:
FULL CREDIT GOES TO 'test username 5' on Gamefaqs.com
so please don't downvote, if you do, please leave a comment so I can try to fix it! thanks!

for this achievement you need to finish command training in training mode with all 24 characters. so first you need to unlock all of the secret characters.
TIPP: finish your current character command training because when you drop out in the middle of it for example while your doing combo number 60 out of 110 training combos you need to start all over again from number 1. so make sure to finish one character and then leave the training mode after you received the title for beating the command training.