Again, I am not referring to the intransitive usage of 完成する.

> **Examples**
>
> 文を完成させなさい。  
>  文を完成しなさい。
>
> 夢を実現させた。  
>  夢を実現した。

From my understanding of the grammar, させる implies that you could be making
other people help you along as well, but I'm not sure, it seems like in the
example sentences there shouldn't be much nuance differences.
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nuances
Difference between 完成させる and 完成する (transitive usage only)
It depends on whether させる is causative or transitive that it means that you
make other people do it. Both させる and する can imply that you involve other
people.

When させる is transitive (not causative), they (する and させる) are the same. But
the させる version is more common, especially 完成させる is much more common. If I
were to find 文を完成しなさい on Lang-8, I would correct it to 完成させなさい.
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2015-08-18T03:46:04.317
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Most Sino-Japanese words could originally be used both transitively and
intransitively, some even as all verb, noun and adjective, as they are in
Classical Chinese. But since they have been more and more Japanized, many of
them were assigned a fixed grammatical status like other native words.

完成 is almost _exclusively intransitive_ nowadays. Dictionaries _may_ say it's
also transitive, but that usage has nearly died out in actual world (though
not incomprehensible). Thus, if you'd like to use 完成 transitively, you should
choose 完成 **させる**.

実現 still retains the ambiguity, so unfortunately you're not able to know if a
実現する is "to realize" or "to be realized" without help of context. In your
case, 夢を実現する is not ambiguous (because it takes を), but 夢を実現させる allows two
interpretations: "realize one's dream" or "make one realize one's dream".
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