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Check out the v.269 Ride the Lightning patch notes
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[Area Exploration] Rien achievement not given
Bug type: Achievements
Brief bug summary: [Area Exploration] Rien achievement will not be awarded despite having gone to every area, with the game acknowledging that I have done so. It has been this way for quite a while, account-wide. I have traveled to every map again to try and trigger the achievement on several characters, but it will not work.

It is marked as incomplete, despite saying that I have traveled to 20/20 maps.
Character name: Doridoes
Character level: 113
Character job: Adele
World name: Aurora
Date and time of the incident: 12:08 EST 7/10/20 (has been this way for at least a year)
Comments
http://forums.maplestory.nexon.net/discussion/18826/maple-achievement-nautilus-exploration-achievement/p1
I think the main issue is that these achievements are not synced properly.