The Carrier Battles Map Pack Add-on for Battlestations: Pacific has 5 achievements worth 150 gamerscore.
Protect both carriers as the Japanese in Escort mode on Map 12.
Win a large map sized Island Capture mission on Map 14.
Win 3 straight rounds without loss as the Japanese, in a battleship Duel on Map 13.
Win a Siege mission on Map 11.
Win a Competitive match without losing your submarine on Map 12.