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