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