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.
Get to the end of 1000 Knights.
Finish the game.
Finish the apartment level.
Complete level 3 of Generic Knight.
Listen to all the cassettes.
Clean up the broken objects in the apartment.
Finish the high school level.
Let the Keykeeper catch you while holding the hall pass.
Find the 3 strange medicine bottles.
Complete the Thunder Rangers poster in the High School.
Finish the house level.
Complete the house without being caught by any ghost.
Put all the soldier and knight toys in their respective bases, in the House.
Don’t get hit by enemies while in the Otherworld.
Enter the Otherworld for the first time.
Finish the tutorial.