Item description:

This save is ONLY INTENDED for earning "You Win a No-Prize" - Complete game 100%

I really wanted to make a Save Set for this game, but I had to play it co-op with the girlfriend and she wasn't going to let me quit the game every time there was a achievement to be earned. Anyways, I recommend using it for only this since the save is at 99.8% and it will pop other achievements as well.

Instructions:
Load the save.
Buy last available character
Replay a story related level in Free mode
As soon as level starts Save & Exit
Achievement unlocked

**Other achievements unlocked with the save while testing with a dummy: (WARNING: Use at your own discretion)
Billionaire Philanthropist - Collect 1,000,000,000 studs: As soon a you pick a stud it will unlock
Alter Ego & I'm Always Angry - Perform all big LEGO figure transformations & Transform into the Hulk 50 times: Change to Hulk and transform one time.
Ultimate True Believer & Stan-tastic - Unlock all True Believers & Rescue Stan Lee from every peril: Replay any level and quit as soon as the level starts.
Really?, Bad Luck, Zoo Believer, Guardians of the Galaxy, Sinister Six, I Am Iron Man, Avengers Assembled, To Me My X-Men & Brotherhood - Unlocks all character related achievements: Buy last character, replay a level and save & exit as soon as level starts. (You have to be careful doing this, they will unlock at the same time, so make sure you already unlocked some of them. Remember NOT!! to replay a level until you're ready to ear the 100% one since you just bought the last character.)
Road Rage - Destroy 100 vehicles in the Manhattan hub: Drop from the aircarrier and destroy any vehicle at ground level.
It's Clobberin' Time - Defeat 100 enemies as the Thing: Replay a level, switch to the Thing and kill the first enemy you see.
Stan's Soapbox - Turn into Stan Hulk: Switch to Stan Lee and transform holding Y.

I only listed the ones that didn't require too much effort, but I suppose you could do some others since you already have all characters and vehicles.

Hope this helps, Enjoy!!