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
Get A+ on all levels on normal
Finish the game on hard mode
Use every weapon in the game at least once
Get the big picture
Clear a level with each of the Son's techniques
Perform a 20x combo
They won't reach the Nuclear Throne
Clear all of the Writer's levels without killing
Shoot two enemies during a chainsaw finish
Meet up with the Biker
Unlock THE ABYSS
Finish the game
Unlock all of the Son's techniques
Clear a level with each snake mask
Clear the 1st floor of NO MERCY with the silencer
Finish HOMICIDE without using guns
Finish SUBWAY without the Gang Leader seeing you
Perform a 15x combo
Die 1000 times
Unlock all weapons for the Soldier
Unlock all snake masks
Destroy 100 electronic devices
Perform a 10x combo
Clear a level with each Fan
Unlock all the Fans
Perform a 5x combo
Do as the Director says!