Answer:
The answer is indeed the act of achieving.
Explanation:
The word "achievement" is formed by adding the suffix - ment to the end of the verb "achieve". A suffix is a letter or group of letters added to the end of a word to change it into a new word by altering its meaning. Some commonly seen suffixes are: -ly, -ness, -less, -ful, -ment, -able and so on.
The suffix -ment comes from the Latin -mentum, which indicates the product or result of an action. Thus, when added to "achieve", that suffix forms "achievement", which is the result of achieving, or the action of achieving.
