Complete a game in "Timed Challenge" mode. You can set the difficulty to easiest. You can use Rewind as much as you want. You don't need to get a good time. You should try to one credit clear. You should try to get a decent score, but you don't have to go crazy for points.

Timed Challenge is the way you should be playing almost all the time (except the first time so you can see the credits and other parts that Timed Challenge Cuts out) unless you want to save and load. "Amazing Job!" should not be rare. "Amazing Job!" is free.

(If I am wrong, please post about it so others can avoid wasting time.)