At the moment, there are no Steam achievements for this game. However, there are achievements available in-game. They are presented upon completion of the game. These are really just for your own enjoyment!

Let me know if you have any questions!

For using the jetpack to get around

Take off in the jetpack at least 15 times.

Putting all the bottles safely away

Put all the chemicals away without leaving any behind. Wait to grab the key until you've stored all the other chemicals.

Making mistakes does not count against you.

For placing a doll in every room of the dollhouse at once

Put one doll into each room of the dollhouse and then press the red "CHECK" button. No immediate action will occur, but you will receive the reward upon completing the game.

Winning all levels in Difference Detective

Win all ten levels of Difference Detective at the Screaming Banshee Inn.

Tip
If you click the options icon, the game will "pause," giving you extra time to spot the differences.

Confidential

Find at least one out of three easter eggs.

If you need help finding the easter eggs, check my guide here.

For seeing into the future

Ask Madame Isibéal for a fortune at least 15 times.

For turning the leprechauns round and round

Spin each of the 7 leprechaun statues 10 times.

For your bold use of color

Print each of the four plates using all four colors, for a total of 16 sheets. You can skip the drying step, simply print them then shred them.

For giving the sheep new looks

Shear 10 sheep correctly and fill five total bags of wool.

For providing Kyler with all the clues

Inform Kyler about the discovery of Matt's ring, Matt's eyeglasses, and Matt's luggage.

Getting those drink orders filled

Prepare at least 8 rounds of drinks at the Screaming Banshee Inn.

At the end of the game, you will see a trivia question just before the in-game awards and credits. Provide the correct response to the question.

Tips
Once the trivia question appears, make sure to save your game. This will preserve the question, allowing you to reload the save file and make another attempt if you answer it incorrectly.

Or you can use a spoiler below:
On what day was the wedding scheduled? June 1st
Which metal was not shown on the density list in the library? Nickel
In which borough of London does Kit work? Tower Hamlets
What is the name of Fiona's crow? Spiaire
Which flower was not listed in the herb book? Clover
What was the name of Fiona's mother? Caitlin
Which element was not listed as one of the Incompatible Chemicals? Chromium
The fortune teller's name was: Madame Isibéal