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We need him to accomplish this task.
Is this an ambiguous sentence?
I think the possible interpretations are:
1: We can't accomplish this task without him/We need him in order to accomplish this task.
2.Him is the understood subject of the infinitive clause, meaning that "he is the one who should accomplish the task"
Which one is correct , or two options are both possible?
We need him to accomplish this task.
"Need" could have the sense of "want", in which case it's a catenative verb, taking the infinitival "to accomplish this task" as its catenative complement. "Him" is then the semantic (understood) subject of the infinitival clause, and the syntactic object of "need". "Him" is called a 'raised' object because the verb it relates to syntactically is higher in the constituent structure than the one it relates to semantically.
Alternatively, the infinitival clause could be a purpose adjunct, cf. We need him (in order) to accomplish the task. In this interpretation, the matrix subject "we" is antecedent for the missing subject of the infinitival.
You are correct, this is ambiguous. In spoken English, it would be clear from tone and emphasis. In written English, you have to work out which it is from context; a competent writer will have made sure that it's clear.
