How to get lottery achievement? Are there any weekly lotteries? I saw a lottery before in the forum but I did not have the right amount of TC

You get the lottery achievement when you buy or win a lottery ticket, since these new lotteries are different (you don't get a token), you really can't get the achievement at the moment.

And unfortunately, there aren't weekly lotteries, but stay tuned, a new one may come sooner than you expect ;)