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There are two events Sonic Dash Collection (collect 12000 blue candies) and The Great Chase (come first in leaderboard by collecting blue candies) . The rewards you mentioned are for first one and it seems for second event rewards are only one each of five shown boosters.
You get your badge?! I tagged @Crazy Cat Lad on my screenshots of my progress and I'm on the @Diamond_Lim tag list and I didn't get it. How'd you get it?