Here is the full list of all 10 Office Space: Idle Profits achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Unlock the Executive Boardroom
Tap 1,000,000 times
Place another character on the same floor as Milton
Burn The Building Down
Reach level 48
Reach level 89
Buy 150 Upgrades
Own 30 Interns
Get any character to level 15
Get any character to level 20