Twitter just released a new archive feature giving users access to their entire archive of tweets (including retweets) going back to when they first signed up. It features an interface that lets you view your archive by month or search by keywords, phrases, usernames or hashtags. This new feature will slowly be rolled out to users over the next few weeks.
Go to Settings and scroll down to the bottom to check for the option to request your Twitter archive. If you do see it, go ahead and click the button. You’ll receive an email with instructions on how to access your archive when it’s ready for you to download.