Here is the full list of all 30 The Darkside Detective achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Search 10 bins.
Examine 8 cars.
Fully explore the vents
Read all the book titles in the library.
Slack off the job and read a trashy mag in each case.
Listen to all of Dick Brickman's radio shows. Featuring Dick Brickman.
Use the kango hammer on everything in the sewers before advancing.
Complete the virus minigame in three steps.
Spot the Darkside SkyBeast.
Listen to all of John's gags.
Enter the Cursed Lodge.
Take all of the Turner's calls in the Bloodwolf HQ.
Check Roy's Alibi
Close case 7: Buy Hard
Take a photo at the photobooth
Remember neglected responsibilities
Play games in arcade
Watch the credits to the end.
Close case 6: Don Of The Dead.
Close case 5: Loch Mess.
Close case 4: Police Farce.
Give Laxatives to McKing.
Close case 3: Disorient Express.
Close case 2: Tome Alone.
Close case 1: Malice In Wonderland.