Here is the full list of all 35 Hotline Miami achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Get A+ on all the chapters
Unlock all achievements
Perform every ground kill in the game
Kill the crapping gangster with a fireaxe
Kill the panthers using Brandon the Panther
Wear all masks at least once
Collect all the masks
Clear chapter 2 using Nigel the Bat
Collect all the puzzle pieces
Beat the epilogue with secret ending
Solve the puzzle
Perform a 12x combo
Perform a 10x combo
Go to the car 60 times
use all guns at least once
Find Jones The Crocodile
Complete chapter five barehanded
use all throwing weapon at least once
use all melee weapon at least once
Unlock all weapons
Die 1000 times
Kill three or more enemies with the same brick in one throw
Kill two enemies with the same brick in one throw
Beat the epilogue
Beat the mainstory
Kill 1989 enemies
Kill 99 dogs
Destroy 200 glass panels
Use a human shield
Get an A+ on any chapter
Perform a 8x combo
Throw a weapon at an enemy so that his weapon hits another
Perform a 6x combo
Perform a 4x combo
Kill an enemy with a brick bounced against a wall