Full list of all 28 Cuphead achievements worth 1,000 gamerscore. It takes around 20-25 hours to unlock all of the achievements on Xbox One.
Defeat a boss
Defeat every boss in Inkwell Isle I
Defeat every boss in Inkwell Isle II
Defeat every boss in Inkwell Isle III
Complete the Casino
Defeat the Devil
Get an S-Rank
Obtain an A-Rank or higher on all bosses in Inkwell Isle I
Obtain an A-Rank or higher on all bosses in Inkwell Isle II
Obtain an A-Rank or higher on all bosses in Inkwell Isle III
Obtain an A-Rank or higher on all bosses in Inkwell Hell
Obtain all Super Arts
Buy everything in Porkrind's Shop
Get every coin in all of the levels
Get every coin in the game
Complete 20 parries
Complete 100 parries
Complete the game on Expert
Complete all levels without killing an enemy
Complete a level without getting hit
Defeat a boss with a Super Art
Defeat a boss with an Extra Special move
Defeat King Dice without taking a hit
Defeat a boss using only the mini-plane bullets
Find a shortcut
Parry five times before hitting the ground
Give in to the Devil
Complete the game on Normal