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