Uboat Attack

Obtain all other trophies

Promote to Admiral rank

Unlock Balao Class ship

Win 50 Fleet battles

Finish Liberation mode

Reach level 20 in Raid mode

Shoot down an enemy torpedo during an underwater mission

Promote to Ensign rank

Unlock Hipper Class ship

Build 50 ports

Unlock all ship slots in Fleet mode

Unlock half of the cards in Fleet mode

Upgrade any ship to max level

Upgrade any card to max level in Fleet mode

Use all types of rockets in one mission

Complete a mission without using basic torpedos

Complete 10 missions in a row without failing

Use revive

Use the same special attack 3 times during one mission

Destroy an iceberg

Promote to Seaman rank

Unlock Gato Class ship

Make 5 perfect shots in one mission

Complete bonus mission