Seems to me that if you jump and quickly press M1 you can pick up an item repeatedly 2-4 times and in the case of roses get 4 times the renown from it.
I have tested this on single bottles of rotgut that then give me between 2-4 bottles when I jump and quickly click on them with M1. Given how sensitive this game is to reading even a single click as a double click this exploit seems a really big way in which renown can be gained to quickly or beyond the maximum amount officially attainable.
This also probably explains why the Handerker-thief achievement popped up early for me, and also why I've just had The Draught achievement pop up despite not having opened all of the shutters.
I got the handkerchief achievement early too, but I think it's unrelated to this bug. I got the achievement when I loaded a save, and I knew I hadn't gotten all the handkerchiefs.