Is it acceptable to include 'at one sitting' and 'all in all' in my sentence? Would it be better if I omitted these words?
The scouts gathered around a bonfire, and their leader could count them all at one sitting; they were 112 all in all.
Yes, delete them. They are not right in your context. , all in all usually appears in a context where you are summing up your facts.
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Yes, delete them. They are not right in your context.
.at one sitting usually refers to dining arrangements.,
all in all usually appears in a context where you are summing up your facts.
they were 112 is not wrong, but much more common is eg There were 112 of them. I'd make it a new sentence, and delete the colon,