Here is the full list of all 23 Victory At Sea achievements.
Complete the Pacific Campaign as Japan.
Win all the historical battles.
Complete the Atlantic Campaign as Germany.
Own at least one ship of every category.
Sink at least four enemies in combat with a fleet of submarines.
Complete the Mediterranean campaign as USA or Britain.
Complete all the campaigns.
Complete a campaign on Expert difficulty.
Complete a campaign on Hard difficulty.
Complete the Atlantic campaign as USA or Britain.
Capture fifty ports.
Capture an enemy operative.
Capture an enemy captain.
Complete the Pacific campaign as USA or Britain.
Sink six combat ships in battle when commanding a single ship.
Sink three combat ships in battle when commanding a single ship.
Recover covert intelligence.
Earn five hundred million warbonds in a single campaign.
Sink ships from each ship category.
Earn one hundred million warbonds in a single campaign.
Sink one hundred ships in campaign mode.
Sink twenty destroyers in campaign mode.
Sink to the bottom of the sea.