Is it possible for me to apply I-485 on my own when I have I-140 approved and having receipt number? I am on L-1A visa, employer is not ready to neither provide I-140 approval notice nor file I-485. What documents you need to apply for I-485, is there any documents required from my employer, who actually is not cooperating so that I do not leave, which I do not intend to leave.
You will need a confirmation of continued employment ("job letter") to file I-485. You should also put in a FOIA request to see you if you can get a copy of the I-140 approval.