This is a story related achievement which will unlock with natural story progression.
After completing the experiments at the butcher shop you will question several peoples and investigate both crime-scenes involves in the murder. You will need to fill out the rather lengthy time line surrounding both murders. This time line is quite simple as you have all the information you need attached to the markers, place all the markers on the board in the following locations:
Time Line Part 1:
00.00 - Three standing men
00.20 – man walking right
00.30 – 00.35 –Man and lady standing
00.40 – Man walking right
00.43 – man walking towards the screen
00.44 – Man walking right
00.45 – Man running right
1.00 – Horse standing.
00.45 - 1.00 - Place the body starting at 00.45
Time Line Part 2:
1.30 – Man standing
1.30 – Picture of clock face
1.35 – Man and women standing
1.42 – Man walking to the left
1.44 – Man with lamp
1.35 – 1.42 – Place the body starting at 1.35
1.00 – 1.20 – Icon of Holmes at Watson, starting at 1.00
This is a simplified version of the time line explanations, just match up the corresponding icons to the placement. You can use the information provides on the cards displayed next to each icon.