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You will obtain 100% in this game once you have satisfied these requirements:

Collect all 250 Gold Bricks
Complete each story level and bonus level (15 bricks)
Attain 'True Believer' in each story level and bonus level (15 bricks)
Collect 10 minikits in each story level and bonus level (15 bricks)
Rescue 1 Stan Lee in Peril in each story level and bonus level (15 bricks)
Rescue the remaining Stan Lee in Peril, 1 in each of the 7 hubs and 13 in Manhattan (20 bricks) (refer to "I Am Iron Stan")
Collect the remaining gold bricks in each of the 8 hubs by completing puzzles and character side-quests (170 bricks)
Unlock and purchase all 18 Red Bricks (refer to "Going Knowhere")
Unlock and purchase all 196 Characters (DLC not included)
Unlock and purchase all 38 Land Vehicles and 25 Air Vehicles
Create a custom character (refer to "Create a Super Hero")

When you have achieved 100%, land on the Avengers Tower landing pad and walk straight into the elevator.
When you exit, head to the second level (there is a bar on either side and a lounge area in the middle). In the middle of the lounge area is a device with a switch. Pull the switch and a colored globe will drop from the ceiling, studs will start falling and spew from the fountain, which will unlock the achievement.

Note: To purchase all 63 vehicles, make sure that you visit both the red and blue platforms located in the hubs as all vehicles are not accessible from one color platform.