Get New Outfits:

Go to the title screen and put in L1, Triangle, R1, Triangle, L2, Square, R2, Square

Get All Wei Generals:

Go to the title screen and put in R1, R1, L1, L2, Square, Square, Square, Triangle

Get All Wu Generals:

Go to the title screen and put in R2, R1, L2, L1, Triangle, Triangle, Triangle, Square

Get All Shu Generals:

Go to the title screen and put in R1, R1, L1, L2, Square, Triangle, Square, Triangle

Get All Generals:

Go to the title screen and put in R1, R2, L1, L2, Square, Square, Triangle, Triangle

Unlock Dynasty Tactics 2 Preview:

On the movie menu, press TRIANGLE.