Here is the full list of all 12 FREEDIVER: Triton Down achievements.
Escape the Triton
Discover a mysterious creature within the Blue Hole
Escape the ship with no deaths
Find all deceased crew members
Escape the ship without utilizing a glowstick
Escape the ship without using an emergency O2 tank
Die by fire
Access the storage room
Complete the tutorial
Break a lock using a frying pan
Escape the kitchen using a frying pan
Complete the Blue Hole Mission