We can't achieve some tasks successfully in a single/first attempt.
We can't achieve some objectives successfully in a single/first attempt.
We can't achieve some goals successfully in a single/first attempt.
Please check it.
In idiomatic English we would probably say We can't always achieve our goals successfully on the first attempt. (You can use 'objectives' instead of 'goals'. ) CJ
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In idiomatic English we would probably say
We can't always achieve our goals successfully on the first attempt.
(You can use 'objectives' instead of 'goals'. 'tasks' doesn't work well.)
CJ