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
That's not how it works...
Complete Unsolved Case Playing as Ally
Direct the laser to the wrong goal
Lose 100 balls
Complete the forklift maze
Complete Unsolved Case Playing as Old Dog
Enter the shipping container and get trapped
Correctly tune the walkie-talkie