I'm currently a university student working on a machine learning project. Would it be possible to download the database of tactics for my project to train on, and if not, how could I (gently) pull the information from lichess? Thank you so much for your help!
no you can't.
It's unlikely that Lichess would provide such a download because it's a massive waste of bandwidth. "A machine learning project" is also too vague to convince exporting such data to a stranger. When you can author a proper proposal (hopefully convincing otherwise it'll probably get outright rejected), write to lichess's contact email with it. If you're lucky you might get a download, but I wouldn't recommend getting your hopes up.
You might be interested in the package of 17,000+ tactics that were gathered from a different tactics website. I have made them available on my website.
http://gorgonian.weebly.com/uploads/1/7/2/2/17221082/cts2.pgn
http://gorgonian.weebly.com/uploads/1/7/2/2/17221082/cts2.pgn
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