Deadliest Catch: Sea of Chaos

When you offload crab you have to toss them in from a distance using a guide and the (A) button. There is a swinging crane pulley thing that gets in your way also. What you need to do is make sure your have a large capacity storage boat like something with 100,000 lb capacity so you have enough crab to meet the quota of 50 completed throws. If you hit the pulley at all it will stop you from getting the achievment during that offloading session. I suggest to save at the dock using the cabin & save menu then unload. If you screw up, quit the game and reload the campaign episode and you will be at the same spot before unloading. Take your time and don't worry about streaks. Your objective is to unload basically the whole boat without hitting the crane pulley. If your having trouble just wait until the bucket is on the right side and the pulley is on the left and keep mashing (A) to fill it up as quickly as possible before it starts swinging in front of the crane pulley. A bit of practice and I was able to constantly knock out 50-60 streaks without any issues.

Make sure to use a crew member who has a high offload ranking (4 bars at least) and is well rested.