What does 则 act as/mean in this sentence?
目标远大则成就伟大。(think big goals and win big success)Is it just there to show emphasis or contrast? Can you replace 则 with 却 here?

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Here, 則 means "then".  却 = "however".

目标远大则成就伟大 = When your sights are grand, THEN your achievement is worthy of admiration.

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we can't replace 则 with 却here. because 则，we use it when a good thing has a good influence or bad thing bad influence, as for 却, it's normally a optimistic condition but has a bad influence

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Agree with Jeff: that's means :then

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则 and 却 are not always interchangeable. 则 has many usages. Here, it is not used to show contrast. I could be wrong, but I'm fairly certain.

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目标远大却成就渺小。目标渺小却成就伟大。却是前后句反转时候用。