There are only 2 World Line shown:
Beta World Line: Kurisu dies. For some reason, the world is engulfed in WWIII
Alpha World Line: Mayuri dies, Kurisu doesn't because Suzuha's crash landing prevented the conference to happen. SERN managed to finish their time machine, controlling everything. While it prevents the world into descending into a world war, it is also a dystopia.
Please remember that if Okabe didn't send that d mail in episode 1, the events of episode 22 would occur the same way. That is because, erasing the traces of the first D mail would just send him back to the Beta world line where he originally came from. it isn't a different time line.
Also, Episode 12 confirms that Kurisu was dragged by SERN for their time machine against her will.
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