To unlock these two achievements, you need to pop a total of 300 bubbles. To pop a bubble, you need to tap it when the candy is inside. They can also be popped without being tapped by the game's physics, but I am not sure if those count towards the achievement. The best level to grind these is 2-8. There is one bubble available to pop right as the level starts. Pop it and instantly reload the level. Repeat for just a minute or two until this achievement unlocks. I found using two index fingers (one for the bubble, one for the reload button) was quickest.