Unlock AX Machine Parts:
To unlock the AX machine parts, beat Story chapters on the Hard difficulty.

Unlock AX Pilots:
Beat the Story Mode chapters on Very Hard to unlock AX Pilots.

Unlock AX Tracks:
To unlock AX Tracks, get first in AX Machine Tracks or beat all the grand prix on Master.

Unlock Dark Schneider:
To unlock the Dark Schneider, beat all of the chapters in Story Mode.

Unlock Diamond Cup:
To unlock the Diamond Cup, come in first place in the Ruby, Sapphire and Emerald Cups (on Standard or Expert).

Unlock Master Class:
To unlock Master Class, come in first place in the following Cups on Expert: Ruby, Emerald and Sapphire.

Unlock Sonic Oval:
To unlock the AX Mute City Sonic Oval, beat the AX Cup