You can use the pick random operator to create a list of random numbers, but you often get duplicate numbers in the list. What I've done here is to create all the numbers from 1 to 100 randomly. Then I've chosen the first 10 of them and sorted them into a list beginning with the smallest. Bubble sorting compares them in pairs and moves the smallest to the front.
This was easier in Scratch2 where the List INSERT block included a drop list that allowed you insert or delete an item in first, last or random place in the list. (In Scratch3, you need to use the pick random block and add +1 to list). See inside for code. You can also see an input bubble sort at https://scratch.mit.edu/projects/374479155
