Here is the full list of all 24 Esse Proxy achievements.
Perform a 4x combo
Perform a 6x combo
Perform a 8x combo
Perform a 12x combo
Perform a 10x combo
Kill 100 people using Melee Attacks
Kill 100 people
Kill 500 people
Kill 2000 people
Use Idris Dead Eye Skill 20 times
Use Faceless Energy Shield Skill 20 times
Use H0-P3 Stealth Cloak Skill 20 times
Use Piercing shot 50 times
Defeat the helicopter
Defeat the creator of the virus
Defeat Vulkan
Set Esse free
Find the game developers
Read all lore objects
Hear all he has to say
Get S in all levels
Die 500 times
Get all other achievements
Get the third code to learn more