When the Notre Dame cathedral was heavily damaged following a fire last week, many people rushed to give donations or their support for its rebuilding. One of the companies to donate money to the cause was Ubisoft, who donated €500,000 . The reason for this was the large part the building had to play in Assassin's Creed Unity , and as a result, the publisher also offered PC players the chance to experience the digital version of the cathedral by giving away the game away for free for a week. It turns out people like free gifts, because according to The Hollywood Reporter , the game was downloaded 3 million times during that period.During the development of the game, level designer Caroline Miousse spent a significant amount of time studying photos and working with texture artists to make sure the building was depicted as accurately as they could, leading to suggestions that the company could also contribute their knowledge towards the efforts to rebuild. Ubisoft has since stated that they "would be more than happy to lend our expertise in any way that we can to help with these efforts".We've got the full list of Assassin's Creed Unity achievements - check the list for guides to unlocking them.