America - Front
America - Back
Complete a 5 hit combo against the CPU.
This is similar to Double Time, but longer. I found this easiest to accomplish with Scorpion:
Back, Back, A, Y, Y, B, B.
The first three moves activate the spear, so you have to pause for moment to let the enemy get pulled in close to you before you rapidly press the last four buttons to complete the combo.
Credit: Andrew x360a