How to get all achievements:


Welcome: Start the game.

First Death: Get killed by a girl.

First Kill: Kill one girl.

Suicide: Jump from the roof of the main building (look at the video below).

Boss is dead: Kill the boss girl on the first floor in the main building (look at the video below).


Video that shows the way to the boss girl and a good place to jump:

https://www.youtube.com/watch?v=mTfW3PSToz0