Here is the full list of all 11 AQUARIUM achievements.
Meet Aqua for the first time.
Spot Aqua enjoying your pajamas.
Become lovers with Aqua.
Go shopping with Aqua.
Restore peace to a city with Aqua.
Remember your past with Aqua.
Go on a vacation with Aqua.
Lose all your memories. Although...
Set sail with pirate captain Marine.
Found a new country with Fubuki.
Complete the game.