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.
Buy 150 Upgrades
Own 30 Interns
Unlock the Executive Boardroom
Burn The Building Down
Place another character on the same floor as Milton
Reach level 48
Reach level 89
Tap 1,000,000 times
Get any character to level 15
Get any character to level 20