What is actually our own work: Commonly we would equivalently say “This is all my own work “, for singular, or “These are all my own work”, for plural. For example, what words are used if we take “All my own work” as our own work?

Yes, you can use “achievements” instead of “work” but then drop the “all” and “own” from the above sentences.

Your expression isnt as easily understood by native speakers of English as the equivalent expression provided above. If you want to express your best opinion about the topic, then please read the entire article.

Is

it too strange to use your same expression?