a lot of people have unlocked all the donuts except for the one that you get by beating the entire game without dying once. doesn't matter what ending you get for it, just no deaths. I did it quick by not bothering to get any of the items in my house, none of the coins of tips in the game, none of my work tasks, and didn't buy anything in the last level.
 "Doodle God 2")
 "Bummin' A Ride")
 "Streamline"){kind=icon}
 "Super Crazy Guitar Maniac Deluxe 2")
 "GemCraft Labyrinth")
 "Mud and Blood 2")
 "Clarence's Big Chance")
 "Civiballs 2")
 "Super Crazy Guitar Maniac Deluxe 3")
 "Treadmillasaurus Rex")
 "Bullet Heaven")
 "Flight")
 "The Kitten Game")
 "Sonny 2")
 "Mastermind: World Conquerer")
 "The Next Floor")
 "Cursed Treasure: Don't Touch My Gems!"){kind=icon}
 "All We need is Brain")
 "Days 2 Die - The Other Side")