Steel Ocean achievements

Complete: Pacific Beast, Allied Fleet Pride, Mobile Nation, and Unsunken Archipelago.

Research a Lv8 submarine.

Sink 10 enemy ships with a Lexington's main artillery.

Research a Lv9 aircraft carrier.

Research a Lv8 destroyer.

Sink one ship of every type in a single battle.

Research a Lv9 battleship.

Sink Yamato using a U.S. carrier's torpedo bombers.

Sink Pennsylvania using a Japanese carrier's dive bombers.

Sink 10 Aircraft Carriers.

Research a Lv9 heavy cruiser.

Sink 10 heavy cruisers.