Here is the full list of all 40 DREDGE achievements worth 1,000 gamerscore.
Complete the introduction quest.
Catch all known species of fish.
Deliver the Key.
Surrender the Music Box.
Entrust the Ring.
Relinquish the Necklace.
Give up the Pocket Watch.
Find a use for the relics.
Throw it back.
Have a full cargo.
Catch all aberrations.
Hear a Foghorn echo.
Spot a fish of each category through your Spyglass.
Use Mixed Bait to attract 3 different species to a single spot.
Keep your Haste burn meter above 50% for 10 seconds.
Traverse a long distance with Manifest.
Banish 10 threats.
Use Atrophy on a fishing spot a long way away.
Complete all side quests. One way or another.
Visit every dock in the game.
Solve all fish shrine puzzles.
Install equipment into every slot on your ship.
Research all rods.
Research all nets.
Research all pots.
Research all engines.
Catch 250 fish using rods.
Catch 100 crabs in crab pots.
Catch 150 fish in trawl nets.
Sell a total of $2500 worth of fish.
Sell a total of $1500 worth of trinkets.
Deplete a total of 25 fishing spots.
Have a combined fishing speed of 200%.
Have a combined engine speed of 75kn.
Have a combined light strength of 3000 lumens.
Upgrade to the 2nd tier hull.
Upgrade to the 3rd tier hull.
Upgrade to the 4th tier hull.
Discard 25 fish.
Obtain all other achievements.