To get this achievement you will have to collect all blood samples in the game there is a total of 43 of them, 31 at the first scene, 4 at the second and 8 at the final one.
Tips: When collecting these hold in mind that the blood splatters on the ground hold 3 and not just 2 and the blood stains on the wall close to the floor hold 2 and not just 1.
After getting this achievement you can then use one to get the one below.