Here is the full list of all 32 Dex achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Completed the game
Reunited ill-fated lovers
Acquired the laser gun
Forced Mitchell to confront his past
Reached level 15
Exposed Crash's identity to the world
Maximized a Major skill to level 6
Opened the safe in the Aphrodite
Rescued Shen
Installed 7 implants
Sold all the antiques to Hank
Didn't leave anyone behind
Opened the safe on the Eclipse
Showed THE Armagear hacker who's boss
Bested a war machine
Defeated an old acquaintance for the second time
Neutralized the TruBody gang
Reached level 10
Successfully used the Convince option in a dialog
Performed 20 Takedowns in a single playthrough
Drank more than 10 Energo Colas
Picked 10 locks
Performed a headshot
Reached level 5
Helped an old man off the street
Found Soto
Had a taste of all the 'professionals'
Opened Ellie's eyes
Upgraded a software to its maximum level
Met the new BiofarmTech receptionist
Met the original
Got crushed by an elevator