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