The game has only 7 Achievements. 3 are story related and unmissable. The rest is kinda missable but with a little bit of trying you will get them as well. If not, this guide is ready to help you.
Story-Related Achievements (Unmissable)
As the description says, just start a new game.
Let's get this party started
Again, the description says what to do. Escape the first room.
Complete the game.
As soon as you tied up the fat brother, you search him. Use the sword on him to get this Achievement.
After the other brother destroyed the machine under the hangar, you can press a green button on the left side. Press it several times to open the shortcut and to get this.
As soon as you repaired the machine under the hangar you can make some decisions about the base itself to prepare your escape. There is also an Archive option. Read every entry to get this.
Hug me please
After you finished the game you enter the "credits room". In the left shelf you can find a puppet like the Achievement picture displays. Press it and get the Achievement.