Here is the full list of all 21 NEO AQUARIUM - there are The King of Crustaceans - there are achievements.
Finish the Story at Spiny lobster
Finish the Story at Spiny lobster on Hard difficulty
Finish the Story at Snow crab
Finish the Story at Snow crab on Hard difficulty
Finish the Story at Hermit crab
Finish the Story at Hermit crab on Hard difficulty
Finish the Story at Frog crab
Finish the Story at Frog crab on Hard difficulty
Finish the Story at Corn barnacle
Finish the Story at Corn barnacle on Hard difficulty
Finish the Story at Squilla on Hard difficulty
Finish the Story at King crab
Finish the Story at King crab on Hard difficulty
Finish the Story at Anomalocaris
Finish the Story at Anomalocaris on Hard difficulty
Finish the Story at Diver
Finish the Story at Diver on Hard difficulty
Finish the Story at Ebizuka
Finish the Story at Ebizuka on Hard difficulty
Finish the EX