Gamer has been removed
As far as I'm aware, even if you meet the requirements for this achievement Iori(Ura) and Leona(Ura) are not guaranteed to show, as Rugal can show instead. Below are the requirements:
To have these characters appear, you will need to have between 6 and 9 DM's or SDM's, as well you cannot lose a single round before the fourth battle.
So again, pick a character that you're good with and make sure that you meet the criteria. If Rugal shows up instead, curse at him and restart your game.
Note: To make these easier, make sure that you do the following in the Options menu:
Set the difficulty to 1 (Easiest)
Set your players power gauge to MAX
Set your defence to level 8
Set CPU's defence to level 1