This is a walkthrough for Deadly Premonition which details every Trading Card and Side Quest, alongside a detailed guide to all Episodes;http://www.gamefaqs.com/xbox360/943397-deadly-premonition/fa...
Episode 2 (Part 2) consists of Chapters 11 & 12. Chapter 11 involves a pretty large Otherworld scenario, that introduces a new enemy; The Crawler. I'm not sure if this is the exact name given, but it's a wall crawling enemy that can turn invisible.
To defeat this enemy, you must wait until she is visible and fire one shot at her, preferably from the .357 Magnum (Infinite). With this weapon it will only take 4 shots to kill her. Remember to press B when she sends a purple plume of smoke towards you. If a red aura appears around her, she is charging up and attack and it is suggested that you get as far away as possible to avoid damage. From my experience with Crawlers, they seem to follow a specific pattern; They start by clinging on to the ceiling. Once you have shot them once, they will move to the right hand side wall. After another shot, they will fall to the ground where they will do their purple smoke attack. After you evade the attack, they will move back to the right hand side wall, and then after a shot they will move back to the ceiling. There are a total of 4 Crawler's in the scenario, 3 of which appear one after the other at the end of the scenario.
There are no Infinite weapons to find in this Episode part, however there is an Item Bag available, which may be of interest to you.
To acquire this Bag, you must talk to the person in the cells at the Sheriff's Station, and take the letter to the required person. You must then return another letter to the person in the cells and you will be given a key. Use the key in the correct location to find an Item Bag.
Overall, not a difficult Achievement, but the Otherworld scenario is annoying, as they do tend to be.