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