Here is the full list of all 18 Longest Monday: Unveiling achievements.
Side with your boss
Get your boss arrested at the cost of admin's life
Witness the robots' departure
Reveal the secret of the janitor
Refuse to bring the janitor water
Team up with the blonde woman to get your boss arrested
Complete chapter 5
Get a cactus flower
Reveal the secret of the woman in a hat
Set the calendar to Tuesday 5 times
Learn the name of the woman in a hat
Complete chapter 4
Get fired
Complete chapter 3
Complete chapter 2
Roll over on the admin
Complete chapter 1
Talk with everyone on your first Monday at work