Scott Pilgrim vs. The World: The Game

The fastest way to get this is to do a play through on the easiest difficulty, then after you beat the game, change the difficulty to Supreme Master and play the levels that have a boss at the end (evil exs and nega scott). They must be played through in order, but you can skip all the levels in between. You only need to the play the last of the three Gideon levels for him (Techno base to the end). It will pop after you beat Gideon.
Heres the list of all the levels you need to play to get this achievement:

Shopping District
Casa Loma Parking Lot
Main Stage
Chengdu Gardens
Dragon's Den
Eerie Forest
Final Stage:Techno Base

Thanks to JimiDeluxe for suggesting I add the level names to this, and an extra special thanks to MR WOLF 12000 for being more proactive than me and actually getting the level names for me!

Single Player Easy Supreme Master

1. Fight to get lives from the level 3 boss on easy difficulty. At least 6 lives total will do to get you started.

2. Use this cheat:
Sacrifice a Life for $50 - Hold Left Trigger + Right Trigger then Up,Up, Down, Down, Left, Right, Left, Right, B, A (Konami Code Spoof & Cheats DO NOT disable achievements)

3. Pay off your fine at the video store in the shopping district. Buy the first item "The Mystical Head" for 4.95 which gives you a 1-up.

4. Use the code.

5. Buy more heads.

6. Voola, you have infinite money and can buy your way to 100 maxed out stats in no time making this achievement and all the others CAKE!

*Works even better with a second controller. Don't have to get lives from the Level 3 Boss then.**

**If the store won't let you purchase any more heads just exit to the map and return.*

As I pointed out on my other achevement guide, on the main menu if you input X,X,X,A,B,Y you get the sword of love, the most powerful item in the game, and you get it at the start of every level. It makes the entire game really easy if used with the money cheat to up your stats. I hope this advice is helpful to you.

This achievement is much easier than it looks. Pick which every character you like and just play the game. Enjoy it. You'll gain levels and Canadian change along the way, but be prepared, because even on Easy, you can still get roughed up pretty quickly at level 1.

The key is not to level up (that only grants you more moves) but to save up coins. For $129.99 ($136.92 USD) in the secret shop on level 1 (There is a star on the door and it is where the cars come zooming at you) you can purchase a Biotic Arm, which grants +50 to strength. Buy two, and poof, your strength is maxed out. At this point it doesn't matter what happens, you'll likely 1-hit KO every opponent you face (excluding bosses, of course) Continue to boost until you reach the level cap of 16, at which point you should have enough money to go and buy the Speedy the Porcupine game for $129.99(?) twice. Speed is now 100 as well. I personally maxed out DEF and WP while getting the Gourmet achievement, since I was cleaning out stores. Once your stats are at 100 and you have unlocked every move, fly through Supreme Master. Seriously, fly. It took me less than an hour to run through it with my maxed out Scott by myself.