I combined all bonuses in one single image nicely showing how to obtain it and what is the reward.
Not including direct image since it's too big.
Part 2 of the bonuses for mines released on 22nd Dec - https://www.diggysguide.com/images/asset/christmas-2020-part-2-bonuses.png
Part 3 of the bonuses for mines released on 29th Dec - https://www.diggysguide.com/images/asset/christmas-2020-part-3-bonuses.png
Do share with as many as possible, everyone must get the bonuses! 🙂