Here is the full list of all 11 Ace of Seafood achievements.
Occupy all reefs
Defeat a GiantSquid
Occupy 'Deserted house'
Sink a warship
Occupy 10 reefs
Occupy a reef
Occupy 'Charcoal stove'
Occupy ’Bathtub of blood’
Defeat Super Synthesis Fish
Repel fish invaders
Defeat Super Synthesis Fish using sardine only