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