what's the hidden achievement?

[Gasp]

just curious, is it killing final boss akuma?

[[MeX]]

yeah, the special story chapter.

[Ezekiel]

Defeating Akuma in Special Story Chapter

[Monster]

Originally posted by American shorthair paladin:

just curious, is it killing final boss akuma?

Yes, just finish main story mode. Then you will unlock Kazuya Vs. Akuma fight. Beat him and secret achievement will be unlocked.

[Catratio]

Tips to beat him? I never play Kazuya so I don't know what I'm doing to start with, but I have it on 1 star for simple combos and move assists and I can't land any hits.

[Goro san]

He is cheap as F.
Advice is BE CHEAPER.
Spam airborne laser (if timed right it dodges his 3 fireballs thing and hits him). If he gets close wait for him to do something (atacking is useless he will parry EVERYTHING) then counter with move that pushes him back (i use LP,LP,RP).
Dont bother with throws those wont work.
Also at end of fight he will do his rage atack you MUST counter with yours.

[Dgo]

Originally posted by Catratio:

Tips to beat him? I never play Kazuya so I don't know what I'm doing to start with, but I have it on 1 star for simple combos and move assists and I can't land any hits.

Set the difficulty to the easiest possible.