There are many achievements in Lost in Random, and some of them involve solving puzzles. One of these is the Dockworker achievement. To complete this achievement, you will need to head to the Harbor in Onecroft.
In the Harbor, you will come to a path with several red security lights. Do not go through this path. Instead, go to the left and you will find a ladder. Climb the ladder and you will find a platform that seemingly is a dead end. This is where you must complete the puzzle.
You will see a blue button ahead and to the left. To complete the puzzle, you will need to shoot this button with your slingshot. Cross the girder to the platform and shoot the button. This will move the crane and allow you to continue. Move to the next platform and shoot the button again. This will move the crane once more.
On the next platform is a collectible. Grab it, and then shoot the button another time. This will move the crane again and allow you to cross. Avoid the two red lights as you make your way across. Continue and you will see a prompt to jump down the crates. Do so and you will earn the Dockworker Achievement.