can anyone check this translation for me please?

that's not Chinese, that's Cantonese or Taiwanese
because
Traditional characters are not used in Chinese language since 1964...

the sentence structure is wrong...

it might have been:
"having no significant intelligence no way to achieve truly great madness"...

but in fact, madness is a negative word, means being out of your mind as if the brain doesn't word properly or angry...
the word insane is better for the context...
coz insane often means living in your own fantastic world, different from the real...

neither English nor Chinese are your native languages...
:)

Even if it is a really great mad action, it must be achieved by intelligence.

I wouldn't get that tattoo. The translation is wrong. Unfortunately, my Chinese is not that good that I can give you a better translation of your phrase, but by just reading the Chinese phrase, it doesn't make any sense at all, let alone mean something similar to the phrase in English.

My advise: don't use Google Translate or other translation sites to translate phrases for tattoos. You'll end up getting something completely different and weird.

I looked it up on WORLD LINGO and this is what they came up with....

"Really great crazy not impossible to achieve does not have the significant intelligence"

there were a few meanings for it try this wed site