Here is the full list of all 32 Dex achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Reached level 15
Didn't leave anyone behind
Showed THE Armagear hacker who's boss
Bested a war machine
Installed 7 implants
Exposed Crash's identity to the world
Drank more than 10 Energo Colas
Opened Ellie's eyes
Opened the safe in the Aphrodite
Reached level 10
Defeated an old acquaintance for the second time
Helped an old man off the street
Picked 10 locks
Neutralized the TruBody gang
Performed 20 Takedowns in a single playthrough
Performed a headshot
Reached level 5
Completed the game
Rescued Shen
Found Soto
Had a taste of all the 'professionals'
Reunited ill-fated lovers
Forced Mitchell to confront his past
Successfully used the Convince option in a dialog
Acquired the laser gun
Maximized a Major skill to level 6
Upgraded a software to its maximum level
Sold all the antiques to Hank
Opened the safe on the Eclipse
Met the new BiofarmTech receptionist
Met the original
Got crushed by an elevator