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Published on Jul 12, 2012
Your first chance to get this achievement is during the level "Through the Glass Flooring" during the Red Wing.
Once you have all the dimensions unlocked, take a safe (in fluffy dimension), and put in on top of the large glass flooring. Now switch back to normal dimension to break it. Drop down onto the conveyor belts, and go to the little door on your right hand side. Once through the door, you will see a portrait of your character on the wall. Switch between all 4 dimensions, and you will unlock the achievement.