There are 67 medallions in total across the three chapters. Certain stages within the chapter have either an extra one or two more challenges within the same stage that will open up when you complete it. An example of these bonus challenges would be beating the stage within a certain time, complete level without the falling blocks landing on your Raskull, don't run out of energy, or keep some charges in your wand leftover.
There are some extra stages within chapters that are not required to play through to complete the story but are required for obtaining all 67 medallions
. Here is the medallion total for each chapter:
Chapter 1 = 20
Chapter 2 = 23
Chapter 3 = 24
Most important tip for these are to be patient, develop a pattern, and try to think a couple moves ahead. If you get frustrated and believe me some levels are seem ridiculous, turn off the game and take a breather, come back later with a clearer head and try again.
Personally, I was stuck on the Pomp and Circumstance
stage, had to replay it over and over. Finally was able to finish it and decided to look if they have some run through on YouTube. If you are having trouble, check YouTube with the name of the level on seeing just exactly what to do and which blocks will help you obtain the medallion, hopefully someone nice uploaded a tutorial. Here are a couple for some of the tougher challenges:
**Pomp and Circumstance - No Squash
Credit to MaxlockMarkCinder Certificate
Credit to MaxlockMarkAntique Antics - Timed
Credit to MaxlockMarkBoom Town
(@1:44 into video) Credit to Nave360Triple Shroomie Trouble / Soggy Falling Exit - Timed
(@3:00 into video) Credit to Nave360(**) Currently, it seems the block layout has been changed since the update/addons, haven't been able to find a recent video upload of it. ATCS suggests to clear the Xbox cache and play the game offline so that it will revert to the old block layout if you don't mind obtaining an achievement offline.
What clearing the cache does is that it basically erases updates/patches to games, for example you may have been disconnected upon starting a game up so that you could download its update. To clear cache, while on dashboard, press the guide button and go over to Settings > System Settings. On the next screen select Memory and with the Hard Drive highlighted press the Y Button. Then simply select Clear System Cache to do so. Again if you do this method, you need to play offline, so decline the update and play the game as usual.
I don't make the videos but I can try and update the ones that are tougher for some people to get through. Feel free to request or recommend videos that help and I will update the solution.