Here is the full list of all 28 MOMO.EXE 2 achievements.
Miss the deadline
Drink a cup of coffee
Do your job
Complete the project without coffee
See an error widow
Enter the new password
Get momovirus
Agree with the Momo's terms
Destroy the office
Wake up at home
Play Hide-And-Seek
Cook a dinner
Hairdryer
Go to Momo's world
Pull a lever
Activate the mechanism
Complete the minigame
Make your choice
Get back to real world
Comple the game with bad ending
Stay with Momo
Clear the "trash" in time
Solve the math task in time
Clear the "trash" before you have been asked
Solve the math task after timer end
Go to castle
Meet your love
Use Time Travel app to change your choice