Here is the full list of all 15 Devolver Bootleg achievements.
Open the System Menu.
Purchase and launch the Devolver Digital Bootleg Launcher.
Navigate to the Controls page of the System Menu.
Open the System Menu 100 times.
Open the System Menu 1000 times.
Close the System Menu
Plug in a Gamepad.
Unplug a Gamepad.
Try to enter a cheat code.
Kill 100 frogs across all games.
Play as the frog in PikuBiku Ball Stars
Take damage in Catsylvania
Acquire 10,000 currency across all games.
Beat Hotline Milwaukee
Beat the Boss in Enter the Dungeon