First chapter completed achievement
FIRST_CHAPTER_COMPLETED_ACHIEVEMENT47.7%

Achievements and their recorded unlock rates.
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FIRST_CHAPTER_COMPLETED_ACHIEVEMENTCOMPLETED_CHAPTER_ACHIEVEMENT_PREFIX1CREATED_A_LEVEL_ACHIEVEMENTCOMPLETED_CHAPTER_ACHIEVEMENT_PREFIX2COMPLETED_CHAPTER_ACHIEVEMENT_PREFIX4COMPLETED_CHAPTER_ACHIEVEMENT_PREFIX3CREATED_10_LEVELS_ACHIEVEMENTCOMPLETED_CHAPTER_ACHIEVEMENT_PREFIX5COMPLETED_CHAPTER_ACHIEVEMENT_PREFIX8COMPLETED_CHAPTER_ACHIEVEMENT_PREFIX7COMPLETED_CHAPTER_ACHIEVEMENT_PREFIX6ALL_CHAPTER_COMPLETED_ACHIEVEMENTALL_STAR_COMPLETED_ACHIEVEMENTFINISHED_A_FRIENDS_LEVEL_ACHIEVEMENT