Hi out-there. This ACH-help has only been possible due to great and fantastic ISIS:-)

The way to get the ACH starts in The party part; near the big house in the beginning (you have to run up and hear the talking, and then run back where you find a court - here you will find the necessary scarf). Find it BEFORE you are trying to kill the bad guys, Toft and Eriksen. Then get Bente killed (when TOFT is found - go to the right side - Bente will follow him. Here you shall choose "distract Toft" and then "Prepare for a good shot" Then Bente is killed, and when she is dead the game proceed to the next and final chapter. Here after some time and conversations outside and inside a hut you will be able to get close to the snowman in the upper right corner. When you get to it, and you have the scarf the ACH should pop up.