Peggle 2

Here is a easy way to get all challenges completed. The solution is explained in the video below. It takes a bit of time to complete though.

Chances are, you will get this during your first round of play through the various Masters. At the time of this writing, I am personally four short of the goal after having played 3 of the 5 masters. The Optional Objectives appear a the begining of each level and can be viewed in the pause menu.

Each level will be something different, but a vast majority of them are for achieveing a level's Ace Score, clearing all pegs off the board, or beating the level with 3 (or more) balls still available.

There's more than enough optional objectives to get 30, but for the other achievements the best advice I can conjur is to experiment. If you can't complete a level with Bjorn for instance, why not try Gnorman (or Zoidberg)? Or try more indirect shots off of the wall.

Lastly, and especially if you are aiming to have X number of balls left or are trying to clear all pegs, place your shots well nd time it to angle into the bucket for easy free balls.

I made a video which show a very easy objective to complete, if you intend to use the flaw of this game which is to go back to the dashboard of the Xbox One and to quit the game as soon as the objective is completed as it will be counted for the objectives achievements but not validated in the game (it is validated only when we restart the level, when we quit the level, or when we finish the level). Without this flaw, because an objective completed is an objective validated and because, originally, the game don't allow us to do again an objective completed, we must complete all the objectives of the game.
This flaw is not punished because I learned that we don't punish what we do but how we do it, and as it's into the game, it's to the developers to fix the flaw or to punish players who use it.