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.
Find an ending
Sleeper agent
Sacrifices must be made
Rekindle an old flame
He was alive...
Find the evidence
Reinforcements have arrived
Relationships matter
Tell a joke
Find the hidden ending
Escort the investor out
Everyone dies
Get over 50% relationship status with everyone