|Get 30% of all available stars in the Challenges mode.|
There are 50 stars available in the challenges mode, from 10 missions with a possible 5 star rating from each. To unlock this achievement you will need to earn 30% of the available 50 stars, which would be 15 stars, total. You can either get a 5 star rating over 3 missions or a mix of 1 and 2 star ratings from multiple missions. As long as you earn a total of any 15 stars, you will unlock this achievement.
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