In this video guide I will show you how to collect Red Orbs in an unexpected place in mission 2. Right after your first fight you will be in and open area, continue left till you see two paths and take the right one. From there head down a little way and look up and to your right. You will see a small ledge and a hole in the wall above it. Climb up an in the hole to collect the red orbs and the achievement will pop.