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