Here is the full list of all 20 The Complex achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Get over 50% relationship status with everyone
Find an ending
Everyone dies
Sleeper agent
Rekindle an old flame
Find the evidence
Find the hidden ending
Escort the investor out
Sacrifices must be made
He was alive...
Tell a joke
Reinforcements have arrived
Relationships matter