Full list of all 30 The Darkside Detective: A Fumble in the Dark achievements. It takes around 8-10 hours to unlock all of the achievements in the base game.
The base game contains 23 achievements, and there are 3 DLC packs containing 7 achievements.
You helped find true love.
Completed Case 6: Class of the Titans
Credits watched, Division reinstated.
You found the pop-up image in each case.
Listen to all Inhuman League tracks.
Dooley's a cool cat.
Completed Case 5: Royal Fumble
You pet all the animals in the game.
You found all the flashbacks of Dooley's darkside adventures.
You ruined the demon's downtime.
Completed Case 4: Funfair Dismissal
You interrupted a scary yet romantic dinner.
You broke the clown car.
Completed Case 3: Druid's Delight
You discovered the well's secret...
Wait... Did you teach him a trick or did he just trick you?
Completed Case 2: Twilight Years
You examined all of Nanny Dooley's stash.
Drain Nanny's supply of sandwiches and tea.
Completed Case 1: Missing, Presumed Darkside
Ask the masters for their worldly wisdom.
You spotted what Gary was up to on the switchboard roof.
Poke McQueen 50 times.
Complete Case 9: Tales from the Darkside.