Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

We Love CSI Fans! (5 points): Watched the opening to CSI: Deadly Intent.
Strong Reader (5 points): Visit a case file.
Cinephile (5 points): Watch a movie from a case file.
Gearhead (5 points): View the Options screen.
Broken Hearted (80 points): Complete Case 1: Broken Hearted.
Fingerprint Master (20 points): Identify the fingerprint for Dr. Langston in Case 1.
Heart Mender (35 points): Reassemble heart-shaped ashtray in Case 1.
Coulda Been a Contender (80 points): Complete Case 2: Coulda Been a Contender.
Chemistry Master (20 points): Identify the chemical for Riley in Case 2.
Last Gasp (80 points): Complete Case 3: "Last Gasp".
DNA Master (20 points): Identify the DNA for Juarice Briggs in Case 3.
Extinguished (80 points): Complete Case 4: "Extinguished".
Document Master (20 points): Identify the Document for Nick in Case 4.
Deadly Secret (35 points): Identify the makeup worn by the victim.
Crime Scene Impersonator (80 points): Complete Case 5: Crime Scene Impersonator.
Touch of the Irish (35 points): Collect all the bottles of Classic Cork.
CSI: Deadly Intent (100 points): Completed all five cases of CSI: Deadly Intent.
Observant (10 points): Obtain at least a 65% thoroughness score in one case.
Fastidious (25 points): Obtain at least a 90% thoroughness score in one case.
Meticulous (40 points): Obtain a 100% thoroughness score in one case.
Good Cop (10 points): Obtain at least a 65% cunning score in one case.
Enhanced Interrogation Technique (25 points): Obtain at least an 80% cunning score in one case.
Master Inquisitor (40 points): Obtain a 100% cunning score in one case.
Lab Rat (10 points): Earn at least a 65% skill score in one case.
Keeping up with the Hodges (25 points): Earn at least an 80% skill score in one case.
Master Technician (40 points): Earn a 100% skill score in one case.

Additionally, there are two secret achievements:

Just for Good Measure (35 points): Identified both items incriminating Steve Tampson before his final interrogation began.
Rub It In (35 points): Interrogated Horace Willingham after he confesses.