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Collector: Cracked Mogu Runestones
Restore 20 Cracked Mogu Runestones.
Collector: Cracked Mogu Runestones requires you to restore the 
Cracked Mogu Runestone artifact a total of 20 times through Mogu archaeology.
Gather Mogu Archaeology Fragments
Excavate Mogu digsites in Pandaria to collect Mogu Archaeology Fragments. Each restore of the Cracked Mogu Runestone costs 50 Mogu Archaeology Fragments.
Use Mogu Statue Pieces
When solving the Cracked Mogu Runestone, use 
Mogu Statue Pieces to gain a +20 fragment bonus each, reducing the number of fragments you need to gather per restore.
Repeat 20 Times
Restore the Cracked Mogu Runestone 20 times to complete the achievement. Based on gathered statistics, expect to complete around 281 total Mogu projects before finishing all 20 Mogu collector achievements, averaging roughly 28 completions per artifact type.