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