The Pick Up achievement is NOT from picking up literal items in the level but from walking over the little blue orbs that can be found throughout a level. There are 3 in each level and for some you will have to be a specific height to reach them. This guide is less about HOW to get the orbs are more about where the orbs are located as there are many ways one could easily REACH the orbs.
1) There is a table with an owl poster next to it. Beside that table is a cabinet, open that cabinet and the orb is inside.
2) This orb is under the desk below the code combiner
3) This orb is on top of the cabinets above the sink