So I just got the Technique Master trophy. And just last night when I checked the 90 move list posted earlier I had everything listed except "Burning Sandstorm" and "Tigers Fury."
But, I also had "Blazing Kick" (Best Buy DLC move) and "Brawling Uppercut 2" that was not in the 90 move list.
So I went and defeated the 36 people in the arena - got the Battle Master trophy and when I received the "Tigers Fury" skill book as a prize the Technique Master trophy popped as well.
Also, I have not yet gotten the 5000 Yuan story skill book yet. FYI.
At this point in time I have 91 skill books.