SHReK the THiRD

By far the hardest achievement in the game. But with some help, and a little luck, it gets rather easy! For starter I would say do Normal then charming then Grimm.

Doing Normal and charming first let you buy upgrades for all chars and make it easier though it does take a little longer but I found it to make 90% of levels way easy. Most you are able to run pasted everything and don't have to do anything more then fight the end boss and its complete.

Only 1 char is useless. (Sleeping Beauty) She never gets any extra power and fighting the cyclops can be a real pain, without a doubt the hardest part of the game. With a little luck and some practice however they can be done rather easy as well.

Sleeping Beauty (First Cyclops)
First Cyclops is rather easy if you hide. As the cut scene ends move towards the right and try to get him stuck between the pilar and the wall, this will keep him back so you can hit him, and move back to regain health so you don't die every 2 seconds. Keep moving in and hitting him once or twice and then move back to regain health as soon as he hits you. It takes awhile but I got him my 3rd try doing this.

Sleeping Beauty (Second Cyclops)
To beat the second I just used the jump + power attack (A followed by B). The cyclops seems unable to block this attack (normally) and this also stuns him, giving you time to get back away from him. Keep running around and moving away from him and then jump back towards him and do your power attack again, rinse and repeat until you have beat him. I finished him off on my 2nd try using this.

Arthur (Ice Dragon)
Range is your friend! Keep him away from you and run away, Yes he can't move....but his arms will hit anything close. If you look at the ground you can see that there is a different color in the snow. This is a marker to show you how far the dragon can hit you when he reaches out. Again use a jump attack (A followed by B) and try to hit his head. If you need more health I would back away and run around, breaking open barrels to get health seemed to get me killed since I was a 'sitting duck' for him to hit.

Arthur (Prince Charming)
As soon as charming comes after you, run towards the witch and try to gather them next to each other. Attack both at the same time until they are stunned and you can do a finisher attack (Y). DO NOT do the finisher, this leaves them stunned for 2-3 seconds, not much time but you should be able to break off 1 cable in this time without being attacked. Repeat to break other cable, Shrek will be freed and you can finish off Charming, congrats, achievement unlocked!

Hope this helps! Wanted to share this with anyone else trying on this game, I know its rather old but no one seems to have anything posted on Grimm about how to beat bosses so wanted to help! All Feedback welcome!

Easier than it sounds, all you need to do is buy it from the gift shop and select it from the options menu. From there, choose "The Royal Tutorial" and just run through the levels. The hardest things you'll face is probably the sleeping beauty stages(Let's face it, the third X attack has a huge startup lag), the cyclops the giant, and the two minigames(It might just be that I suck at it XD). Once you beat Prince Charming, the achievement should pop up.

Once again, level select does not work. This only costs 1,500 from the shop, so I would suggest doing a few levels on Normal, then buying this and starting over, that way you won't have to do the game three times, but just twice instead. Don't worry too much about any of the perfect level quests, you can use level select on Normal and go back to do any you miss.