Short Answer:
No
Long Answer:
For questions that ask how to do something, where to find something, et cetera, and have multiple valid answers, an accepted answer doesn't need to include every valid possibility, though including multiple of them is nice.
Let's explore an example here. Say, for instance, you are playing Builder Scrolls XVII Sun City (or some other hypothetical game), and you are wondering how to beat the first boss, a monstrously difficult opponent with 17 phases in which they heal to full and grow stronger each phase, and you ask a question here for help. In response, two eager people respond with answers. The first (possibly a Dark Souls enjoyer) gives you a detailed guide that walks you step by step through each phase of the fight, explaining exactly how to beat the boss, exactly as the developers intended you to. The second person (possibly a Dark Souls speed runner) gives you a very simple answer of standing near the edge of the platform, dodge rolling out of the way of the boss' charge attack, and power attacking them in the back to knock them off the platform and ending the fight in the first phase.
You (possibly a tea drinking, British exploiter), care not for what the developers intended for the fight and accept the second answer because you both value your time and your sanity and don't want to fight a 17 phase boss. While the second answer doesn't explain all of the stuff the first did, it was a complete answer, and was most helpful for you. There is a reason why multiple answers can be submitted to a single question.