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