Here is the full list of all 29 Hotline Miami 2: Wrong Number achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Unlock all achievements
Kill 50,000 enemies
Finish the game on hard mode
Use every weapon in the game at least once
Get the big picture
Get A+ on all levels on normal
Clear a level with each of the Son's techniques
Clear all of the Writer's levels without killing
Meet up with the Biker
Unlock THE ABYSS
Clear a level with each snake mask
Finish the game
Finish HOMICIDE without using guns
Unlock all of the Son's techniques
Die 1000 times
Destroy 100 electronic devices
Do as the Director says!
Perform a 20x combo
Unlock all weapons for the Soldier
Unlock all snake masks
Finish SUBWAY without the Gang Leader seeing you
Clear a level with each Fan
Unlock all the Fans
Shoot two enemies during a chainsaw finish
Clear the 1st floor of NO MERCY with the silencer
Perform a 15x combo
Perform a 10x combo
They won't reach the Nuclear Throne
Perform a 5x combo