Learn English – Noun for “act of striving”

"Transcendence" might work for you, if you don't mind the minor New Agey connotations it can have in certain contexts.

If you check it with onelook you will find this noun mentioned in only two sources (which is really rare) and none of them is a major source.

Searching through the books finds about 5,000 results which is not so shabby, but as you point out, usually it is a noun modifier, but you will find cases when it is used on its own.

The two sources that have entries define it differently

• Century Dictionary and Cyclopedia defines it as reception
• Burton's Legal Thesaurus, 4E defines it as acquisition

As Mr. Disappointment mentions there is a word (receipt) that is more common and more clearly defined, so unless you have a very good reason to use it I would leave it alone.

An example of (?)acceptable usage, might be:

receival of receipts

to avoid repetition of a word in different sense.