Promote to Seaman rank
Win 50 Fleet battles
Finish Liberation mode
Reach level 20 in Raid mode
Upgrade any ship to max level
Upgrade any card to max level in Fleet mode
Make 5 perfect shots in one mission
Use all types of rockets in one mission
Shoot down an enemy torpedo during an underwater mission
Complete bonus mission
Complete a mission without using basic torpedos
Promote to Ensign rank
Complete 10 classic mode missions in a row without failing
Use revive
Use the same special attack 3 times during one mission
Destroy an iceberg
Promote to Admiral rank
Unlock Gato Class ship
Unlock Hipper Class ship
Unlock Balao Class ship
Build 50 ports
Unlock all ship slots in Fleet mode
Unlock half of the cards in Fleet mode
