Here is the full list of all 9 Unsolved Case achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Find The Number of the Beast channel
Complete Unsolved Case Playing as Old Dog
Lose 100 balls
Complete Unsolved Case Playing as Ally
Direct the laser to the wrong goal
Enter the shipping container and get trapped
Complete the forklift maze
Correctly tune the walkie-talkie
That's not how it works...