Since some of the items are thin, or behind other objects/on the edge of the screen, you will need some amount of luck hitting them all with button mashing.
I suggest doing this achievement on the first hidden object puzzle located on screen number 2. With a mailbox, clothes, teddybear etc.
Should be very easy if you take your time and do them step by step. Another approach is to take your time and study of the picture. Then start a new game and do this in a 10th of the minute you need. There may be a item or two that is different on the list but should still be very easy.