Complete a certain challenge.

Finish a level without taking damage.

Play through a campaign without using any gems.

Rescue every captured friend.

Beat any level in two player mode.

Defeat King Cepheus.

Use three different types of Yamato weapons in a boss fight.

Survive after being fully enveloped by a bomb trap.

Deliver the final blow to Orion using a solar flare.

Make two Power-Metal missiles collide.

Defeat Cetus while its head is underwater.

Fill up all gem slots in a fully upgraded ship.

Defeat Ursa Major.