Yes, "これは素晴らしい業績に違いありません" is more natural than "これは業績です!" in Japanese.
Usually japanese don't use this word "業績" without "modifier".
An instance, "業績が悪い", "素晴らしい業績", "業績が下降" or "驚くような業績".
If you want to say "This is an achievement!" more literally, "これは偉業です!" is natural. This translation is the same meaning with "これは素晴らしい業績です!". of course "これは素晴らしい業績です!" is good too!
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