There is no such thing as a "reformed" Jew. It is called "reform Jew". Reform Jews celebrate passover as a commoration of the exodus of the ancestors of the Jews from Egypt and into freedom, which is the same meaning passover has to Conservative and Orthodox Jews.
Technically, there is no conversion required for the vast majority of Orthodox Jews who might want to be accepted into a Reform congregation. If an Orthodox Jew shows up in a Reform congregation and takes part in a service, they will be counted as fully Jewish without question. The great difficulties come when Reform Jews get interested in Orthodox Judaism, because Reform accepts as Jews people who are not considered as Jews by the Orthodox -- The Orthodox to not recognize the legitimacy of Reform conversions nor do they recognize as Jews those who claim Jewish status through patrilineal descent.(OK, there is one difficult class where Reform Jews might ask for conversion. The child of a Jewish mother and a non-Jewish father who grew up in a non-religious household would be welcome as a Jew in an Orthodox congregation but might face questions in a Reform congregation because, technically, the Reform acceptance of patrilineal descent is contingent on having a religious upbringing.)
Yes. Orthodox Jews do "everything by the book". Reform Jews do anything they want.
Reform Jews have only 1 seder instead of 2.
Reform Judaism was a movement that started in the 1820s and rejected much of the fundamentalism of traditional Orthodox Judaism.
Reform Judaism had its origins in the Ashkenazi community, but there are plenty of Ashkenazi Orthodox Jews and plenty of Reform Jews with Sephardic backgrounds. In Europe, you can find Liberal synagogues (analogous to the Reform movement in the United States) that are dominated by Sephardic Jews, predominantly in French speaking countries that welcomed many Algerian Jews after the collapse of French North Africa.
The only difference is that in a Reform congregation a woman is allowed to read from the Torah. Otherwise the Torah is used the same way in both sects. Please note that it is Reform Judaism and NOT Reformed. Reformed would mean that the religion has stopped evolving. Reform Jews believe that Judaism should adjust with the times and that is why it is Reform as opposed to Reformed..it is still changing.
orthodox Jews are traditional and reform Jews have mordenised their traditional ways
Orthodox follow halacha; Reform don't.
It depends on the country. In Germany and other Western and Central European countrie the vast majority of Jews were Reform Jews and were not conspicuously different from non-Jews. Thee is no simple test for acculturation, but the general consensus is that they fitted in.
New answer: Reform Jews tend to be less strict than Orthodox, Ashkenazi, Sephardic Jews, but that doesn't mean that they are not observant at all. They wear the kippah (skull cap), tallitot, kittel, etc. Reform services are a lot more relaxed in terms of dress codes, though. However, that doesn't mean the Jew is more relaxed in their attitude to G-d. Old answer: pretty much anything anyone else wears
Yes. My maternal grandmother was Orthodox and married a Reform Jew and she switched to Reform Judaism.