The I-485 looks at issues that were not reviewed as part of the I-140 petition. For example, if you have a criminal record, worked without authorization, or had extended periods of unlawful presence in the U.S., this could impact your ability to get the green card even if your I-140 was approved. At the I-485 stage, your attorney will carefully review your immigration history and background to flag any issues you may encounter for green card processing.