Unlocks after destroying 1,000 ships (all your ships combined).
Unlocks after destroying 10,000 ships (all your ships combined).
Unlocks after destroying 100,000 ships (all your ships combined).
Unlocks after finding 10 secrets (all your ships combined).
Unlocks after finding 250 secrets (all your ships combined).
Unlocks after dying 10 times (all your ships combined).
