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The achievement description states:

Complete all test chambers in all courses of co-op.

Can this be completed in split-screen to unlock this achievement, or does it have to be done over Xbox Live?

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1 Answer 1

up vote 4 down vote accepted

This achievement, along with most other co-op achievements in Portal 2, can be obtained from either split-screen or online play.

The only achievements which require online play appear to be Friends List With Benefits and Professor Portal.

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