Here is a guide on how to get all achievements in The Looker.
Then go through the game normally with the solutions:
In the garden you will find a lot of screens with puzzles, the solutions are the next ones:
For the last one, the start and end point it’s on the wire.
There’s also in this section two voice artifacts:
🏆 2/6 voices
For this one, go to the first door on the image, for the next images just paint until the door its open.
Look at the right for another achievement, then shoot the next door to continue.
Continue throgh the castle and solve the puzzle on the table, also there’s a voice artifact near.
🏆 3/6 voices
Go ahead and shoot to the ships, then go down throw the stairs, interact with the snake machine and win.
Go back to the part where you shoot to the ships and continue to the next room, you have to play the game and score 600.
Go ahead and activate the yellow machine and the two doors near of it:
Go back before you reach the ships part, and you will find a closed door and a stairs, go down to find another voice artifact, open the gate, pick another voice and solve the chess puzzle.
🏆 5/6 voices
Go down to the garden and follow the next screens:
Enter to the maze and follow the next directions: right – middle – straight – left – left until you find the book. This are the solutions for the book.
Go back to the puzzle of the table on the castle, and go upstair, there’s the last voice record.
Also, look through the telescope for another achievement.
Look next to the solar panel, solve the puzzle, go through the door and solve the final puzzle.
Go through the door and finish the game, in the after credits scene there’s another achievement.