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