This is for getting enough decals to color the batmobile the color pink. You will need 10 gold bricks (10 levels played) and a fair bit of studs. Want to also mention that these vehicle tiers (3) cost studs as well as gold bricks. For this achievement you'll need the bottom 8 circles bought. The costs for first row (15,000) each, second for (20,000) each and third row first two are (50,000) each. You'll also need to pay for other unlocks in order to get the next batmobile levels. Once this is done, select the coloring options except for entire vehicle prints and change to pink. Press "Y" and then save the vehicle imprint. Achievement will unlock during this process. Visual guide for this found below.