1.Complete the Angler achievements listed below.
Sea Scorpion Angler
Fat Sleeper Angler
Blackwater Whiptail Angler
Fire Ammonite Angler
Jawless Skulker Angler
Blind Lake Sturgeon Angler
Abyssal Gulper Eel Angler
2.You will unlock:Fishing Shack, Level 3.
3.Estimated Time:2-3 days.