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