Full list of all 32 Who Did It? achievements.
The base game contains 19 achievements, and there are 2 DLC packs containing 13 achievements.
Complete a case in the Crimeroom Only gamemode
Complete a case in the Guess-Lock gamemode
Complete 15 cases in a gamemode exept default
Complete a case in the Guess-Lock gamemode with the Detective difficulty selected
Replay a cutscene
Complete any case on the easiest possible difficulty and gamemode
Reach level 30
Reach level 50
Reach level 100 (max)
Close any case in the Crime First gamemode on any difficulty exept Detective
Close any case in the Crime First gamemode on the Detective difficulty
Change the game language for the first time
Perfect any case (close the case with no hints and no strikes, any gamemode & difficulty)