Observer pattern
ACH_OBSERVER_PATTERN2.7%
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Achievements and their recorded unlock rates.
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ACH_OBSERVER_PATTERNACH_BACKUP_RESTOREDACH_NULL_POINTERACH_OPEN_SOURCEACH_SILENT_TREATMENTACH_CLEAN_COMPILEACH_GOTOACH_HELLO_WORLDACH_CODE_REVIEWACH_ANTI_PATTERNACH_CONTINUE_EXEACH_CRAWL_EXEACH_STICKY_BUGACH_PHYSICS_MATERIALACH_YBIT_ESCAPEDACH_HEAP_OVERFLOWACH_MEMORY_SEGMENTATION