There are 17 achievements in Hello Neighbor Steam version. The same achievements you can find on the PlayStation 4 version. PlayStation Network not shows the number of achievement success, but Steam does.  Here are the top 5 hardest achievements in Hello Neighbor, that have been passed by less than 3% players.
5. Beeep!

Pass rate: 2.8%
Get to the Golden Apple Super Market which is located on the top left part of the map.

4. Meet Joe Black 

Pass rate: 2.7%
It's pretty easy. You just need to put mannequin on the street and let the car drive over her.

3. Is She Ok

Pass rate: 2.6%
Go to the hospital which is located on the top right part of the map.

2. Don't Tell Anyone

Pass rate: 2.5%
Go to the hospital which is little below the hospital.

1. Change For Gas

Pass rate: 2.4%
Go to patrol/gas station which is located on the top center part of the map.