49 synonyms for achievement such as act, accomplishment, and acquirement. Achievement is a noun, and its antonyms are failure and defeat.
Accomplishment, acquirement, act, action, attainment, carrying out, carrying through, close, closing, completing, completion, concluding, conclusion, consummation, coup, creation, deed, effecting, effectuation, effort, engineering, enterprise, execution, exploit, feat, finishing, fruition, fulfilling, fulfilment, gaining, handiwork, implementation, manoeuvre, master stroke, operation, performance, positive result, procurement, reaching, realization, reification, stroke of genius, success, triumph, undertaking, winding up, winning, and work.