Thanks so much, that really means a lot!
For the jackpot turtle unlock, there's actually a hidden mechanic that increases your odds if you spin the slots within a single session (without refreshing or closing the browser). I'd recommend saving up around 500-600 Quartz and then doing your spins all at once for the best chance.
As for the 35 restore cell turtle achievement, that one gets easier when you're able to reach deeper levels, since you'll naturally come across more restore cells the further you go.
Hope that helps!