Here is the full list of all 17 Reef Shot achievements.
Learn the ropes.
Get lost in the cave and come back safe.
See what the volcano buried.
Discover the name of the City.
Explore the tomb of the king.
Look Neptune in the eyes.
Swim past the guardian of Truth.
Find the treasure of the City of Gold.
See the Japanese wreck.
Meet the French American.
Take the difficult path.
Snoop around the ruined town.
Photograph the unicorn.
Stand in front of the altar.
Explore the crypts.
Visit the armory.
Get them all.