Full list of all 11 Press X to Not Die achievements. It takes around 3-4 hours to unlock all of the achievements in the base game on Windows.
The base game contains 10 achievements, and there is 1 DLC pack containing 1 achievements.
Zoom in on Behind The Scenes Photo #8
Finish the game on at least Medium
Chocolate Chocolate. Chocolate? Chocolate.
Get hit in the nuts in every possible way
Don't learn your lesson.
Finish the game on at least Hard
Finish the game on Ridiculous
Finish the game on Ridiculous without dying
Die in at least 23 different ways
Experience at least 90% of the game