Here is the full list of all 22 Clue/Cluedo achievements.
Play 5 Online Multiplayer Games
Complete the (Tudor Mansion) Case File
Uncover all (Tudor Mansion) Suspects Clues
Uncover all (Tudor Mansion) Room Clues
Uncover all (Tudor Mansion) Weapon Clues
Win a Single Player game in Hard difficulty
Complete the (Black Adder Resort) Case File
Uncover all (Black Adder Resort) Suspects Clues
Play a game with an alternative customization item equipped
Uncover all (Black Adder Resort) Room Clues
Uncover all (Black Adder Resort) Weapon Clues
Win 20 Games
Uncover all (Black Adder Resort) Case Clues
Win a game with an alternative Token equipped
Play 5 Clue Cards Games
Uncover all (Tudor Mansion) Case Clues
Play 5 Master Detective Games
Play a game with the Clue Sheet Assistance set to Off
Uncover your first Clue
Ask 3 Key Questions
Play your first game
Play an Online with Friends Game