Slaughter the boss in Stage 1 before it gets the chance to reproduce.
Eliminate another genetic dead end in Stage 2.
His time is up. Finish off the boss at the end of Stage 3.
Imagine seeing that while walking through the woods. Kill the final boss in Stage 4.
Clear every stage twice in a single session without using a continue.
Have every primary shot type in your possession at least once in a single loop.
Clear all four stages within the first loop without rescuing another pilot or using a continue.
Clear all four stages within the first loop without dying.
Clear all four stages within the first loop without taking a hit.