Here is the full list of all 33 Employee of The Month achievements.
Interrupt Manger.
Spend 15 minutes loitering without picking up the first task sheet during the intro.
Obtained an SSR drop from a gacha machine.
Reach one of the normal endings.
Reach one of the joke endings.
Achieved all endings.
Obtained a paycheck with a positive number.
Obtained a paycheck with a negative number.
Read all Newspapers in one playthrough.
Read all of Davey's notes in one playthrough.
Read all of the Janitor's notes in one playthrough.
Read all of the Cult's notes in one playthrough.
Called an available phone number.
Called all available phone numbers.
Discover the 'Car' dimension.
Discovered the secret of the 'Milk' dimension.
Placed all five polaroid photos on the 'Banned customers' board.
Gave all bones to The Stranger.
Landed a 3 pointer.
Visit all dimensions in one playthrough.
Stand in the ball-pit for 5 minutes straight.
Fell out of bounds.
Encountered a Komodo Dragon.
Fed The Flesh some smokes.
Gulped down some form of drink.
Opened the Church door using a code.
IT'S NOT ME?! IT'S THE OTHER GUY.
Did a task that wasn't on the list.
You died lmao.
Beat a "Bad ending" speedrun faster than a time of 0:45:11:00.
Beat a "Good ending" speedrun faster than a time of 0:25:17:00.
Beat a "Joke ending" speedrun faster than a time of 0:00:27:00.
Achieve all achievements.