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Professor Portal

After completing co-op, complete Calibration Course online with a friend who hasn’t played before

Professor Portal0
6 guidesOnline Game ModeCooperativeViral
dropK1CK ninJAdropK1CK ninJA585,889
30 Apr 2011 14 May 2011
52 3 5
You must have completed the co-op campaign.

You cannot get this achievement on split screen.

You have to have them on your friends list.

You can also create temporary accounts that get 1 month of free Xbox Live Gold and you can get this achievement with a friend.

They need to generate a new Windows Live ID -- -- (I went with a generic, DKBOT e-mail address). Sign in with a new account on your Xbox. Attempt to sign-up for Xbox Live Gold, select the "Upgrade Later" option and sign-up under a Silver account. The next screen will offer you a free month of Xbox Live Gold with your new account and accept this offer.

There you go, a free second account and you don't have to find a 48-hour code or attempt to track down a new friend who hasn't started the co-op.
John CabooseAlso, as far as I know you can only create a maximum of 10 one month trial accounts on a single Xbox 360.
Posted by John Caboose on 30 May 11 at 11:13
tylahjamesMe and my friend just did this, work's like a champ.

+1 from Me.
Posted by tylahjames on 03 Jun 11 at 03:27
AlexYou can only create three different accounts with a free one month trail.
Posted by Alex#66005 on 13 Aug 11 at 21:06
zoidberg1339I can't even make one :(
Posted by zoidberg1339 on 27 Jan 13 at 06:33
zoidberg1339I can't even make one :(
Posted by zoidberg1339 on 27 Jan 13 at 22:12