Here is the full list of all 26 Greyhat - there are A Digital Detective Adventure achievements.
Complete GREYHAT - A Digital Detective Adventure
Save the crew.
Expose the corrupt cop.
Learn Seven's secret identity.
Reveal Dante Dimasalang's nefarious schemes.
Find Cassie Watkin's killer.
Identify the sleeping spy.
Eliminate the Savanide threat.
Help the authorities track the kidnapped girl.
Find out what the secret ingredient in Gessner Kola is.
Expose the ridiculous hood-wearing hate clowns.
Land the planes safely before time runs out.
Steal the tech blueprints.
Ensure Senator O'Connell doesn't get another term.
Help the police capture the disgraced ambassador.
Stop Commander Ponchik from carrying out his orders.
Reverse Debra Nielsen's corrupt actions.
Play Undead AfterMath
Stop Tareek's plans.
Find Lahinzi Turanur.
Expose Garymax Pharmaceutical's secrets.
Tunnel into another computer for the first time.
Identify The Fixer.
Collect all wallpapers.
Collect every chapter of The Genie & The Merchant.
Collect all 4 of Willow Way's poems.