Google will save the last 10 log ins to your account. There is not a way to extend this or make them show more. The only way you can get more information on account activity other than what is show to you is to provide information pursuant to a valid third party court order or other appropriate legal process. That is googles policy.
So I am sorry to say there is no way to change the range or the amount of information shown to you unless it was a legal matter and you had a court order.
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