Several archive sites host a direct bundled with a tool called mymc (PS2 memory card manager). The filename you are looking for is usually TTT_Complete.ps2 .
Yes, but with a caveat. RetroAchievements for PCSX2 require you to earn achievements. Loading a 100% save will instantly pop all "Unlock X Character" achievements, which may be considered cheating. If you care about hardcore mode, start from scratch. tekken tag tournament pcsx2 save file link
Ensure Tekken Bowl and Theater Mode are available. Several archive sites host a direct bundled with
: Launch the MyMC application and select your active memory card (usually Mcd001.ps2 : Click the icon and select the downloaded save file (typically in Launch Game the .max file).
Click the icon (green arrow) and select the save file you downloaded (e.g., the .max file).