The description explains the achievements, click and find 2no hidden objects in less than 5 seconds. The first chance you get to do this is after opening the suitcase in your room. If you are playing with tutorials on, the help system will guide you to click on the first object. After that, you are left to find the remaining five items on your own.
If you just study the list, study the screen, you will easily spot two of the objects are next to each other. Just click each one and, the achievement will pop.