If you are actually referring to a tax return that you completed and filed using TurboTax -

See this TurboTax support FAQ for when access to prior year online tax returns expire - https://ttlc.intuit.com/community/prior-year-return/help/when-does-access-to-my-prior-year-turbotax-...

To access your current or prior year online tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/

Scroll down to the bottom of the screen and on the section, Your tax returns & documents click on Show.  Click on the Year and Click on Download/print return (PDF)

You can also get free transcripts of your federal return from the IRS - http://www.irs.gov/Individuals/Get-Transcript