Is the word 'result' as a singular noun grammatically correct? [closed]

Yes, but "result" and "results" have different meanings:

"... and then take pride in the result." = and then take pride in the overall result of seeing all the tasks to completion, i.e. the final, total result: a result = one result.

"... and then take pride in the results." = and then take pride in the individual results of each of the tasks seen to completion, i.e. each of the results. Results = more than one result.