Go to the 'Update 1.5.0: Update Aquatic - Phase Two' area. We will be doing these achievements in a clockwise direction.
If you wish to know the position of this area and the layout of the achievements:
Go to the sign labeled 'One Pickle, Two Pickle, Sea Pickle, Four' and open the chest and take out 4 Sea Pickles, and then place them anywhere but in the same spot till they are in a group of 4 (water not needed). You will unlock:
Go to the sign labeled 'Do a Barrel Roll!' and open the chest and take out a Trident. Go into the water, and use it like you would a bow. You don't need to move far or actually do a barrel roll - you only need to activate it.
You will unlock:
Go to the sign labeled 'Moskstraumen' and open the chest and take out a Prismarine Brick. Go into the water and go to the square structure made of Prismarine Bricks. Place the Prismarine Brick where the signs tell you to place it to complete the square, and this will cause the Conduit to active.
The complete configuration should look like this:
You will unlock:
Go to the sign labeled 'Echolocation' and open the chest and take out a Dolphin Egg (Spawn Dolphin) and a Fish (Raw Cod). Then go to the little water hole next to the chest and use the egg to spawn in the Dolphin, and then feed the Dolphin the Fish.
You will unlock:
EcholocationFeed a dolphin fish to have it lead you to treasure

Congratulations, you just finished the achievements related to 'Update 1.5.0: Update Aquatic - Phase Two'. Go to the next page for the achievements part of 'Update 1.8.0: Cats & Pandas'.
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