Full list of all 42 Cuphead achievements. It takes around 15-20 hours to unlock all of the achievements in the base game on Windows.
The base game contains 28 achievements, and there is 1 DLC pack containing 14 achievements.
Give in to the Devil
Buy everything in Porkrind's Shop
Get every coin in the game
Obtain an A-Rank or higher on all bosses in Inkwell Isle I
Get an S-Rank
Complete the game on Normal
Defeat the Devil
Obtain an A-Rank or higher on all bosses in Inkwell Hell
Complete the Casino
Defeat every boss in Inkwell Isle III
Obtain an A-Rank or higher on all bosses in Inkwell Isle III
Get every coin in all of the levels
Obtain all Super Arts
Obtain an A-Rank or higher on all bosses in Inkwell Isle II
Defeat every boss in Inkwell Isle II
Find a shortcut
Complete 100 parries
Defeat every boss in Inkwell Isle I
Defeat a boss with a Super Art
Complete a level without getting hit
Defeat a boss with an Extra Special move
Complete 20 parries
Defeat a boss
Complete the game on Expert
Defeat a boss using only the mini-plane bullets
Parry five times before hitting the ground
Complete all levels without killing an enemy
Defeat every boss in Inkwell Isle IV
Obtain an A-Rank or Higher on all bosses in Inkwell Isle IV
Defeat a boss with Ms. Chalice
Defeat 10 bosses with Ms. Chalice
Defeat a boss with one of Ms. Chalice's Super Arts
Defeat a boss with one of Porkrind's new weapons
Defeat all of the King of Games' Champions
Defeat the King's Gauntlet
Complete your quest on Inkwell Isle IV
Get an S-Rank on a stage of Inkwell Isle IV
Defeat a boss on Inkwell Isle IV without killing any of its minions
Have 9HP at one time