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