Here is the full list of all 18 Between Me and The Night achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Finish the game.
Listen to all the cassettes.
Finish the apartment level.
Find the 3 strange medicine bottles.
Clean up the broken objects in the apartment.
Finish the high school level.
Get to the end of 1000 Knights.
Complete the house without being caught by any ghost.
Put all the soldier and knight toys in their respective bases, in the House.
Complete level 3 of Generic Knight.
Complete the Thunder Rangers poster in the High School.
Let the Keykeeper catch you while holding the hall pass.
Don’t get hit by enemies while in the Otherworld.
Finish the house level.
Enter the Otherworld for the first time.
Finish the tutorial.