Here is the full list of all 20 NakedMan VS The Clothes achievements.
Beat the second world
Beat the first world
Die for the first time
Beat the first level in a good time
Beat the second level in a good time
Beat the third level in a good time
Beat the third world
Beat the fourth world
Beat the fourth level in a good time
Beat the fifth level in a good time
Beat the fifth world
Beat the game
And your patience
Die a hundred times
Die five hundred times
Die, die, die
Or at least, pour it from the bottle...
You do really like that level, don't ya?