DREDGE

Story Related, Cannot be missed

You will begin Dredge by meeting the Mayor of Greater Marrow, who will explain the basics of fishing during the day and the dangers of staying out at night. Once you are given the loaner boat, head out and get used to the fishing controls and feel free to explore the area. You will only be able to collect Coastal sealife, but there is more than enough in the Inlet for you to make enough money to pay back your loan in full. 

In fact, the first time you are fishing may be a good time to attempt Perfect Packing  so I would suggest checking out that trophy. Whether you fill your cargo completely or only gather a few fish, take them back to the dock and the Mayor will introduce you to the Fishmonger. Sell your bounty to the Fishmonger and the Mayor will offer you a Research Part as well as introduce you to the Shipwright. Once you meet the Shipwright, this trophy will be awarded.