Guild Wars 2

Achievement – Seasonal Mists Defense Restorer
This achievement requires players to repair gates and walls multiple times using supplies. The issue with this is that roaming players are encouraged to drain structure (towers, keeps, and castles) supplies to repair gates and walls, because it is the easiest and fastest method to complete the achievement. This is counter-productive in the large scheme of WvW. Supplies are also necessary for upgrading structures. Example: The castle is being hit with trebuchets. An upgrade is in process. The team understands the upgrade needs to finish, but several players are taking any and all supplies within and repairing structures that are currently under siege, solely for their personal achievements. This postpones the upgrade indefinitely, which ultimately hurts the team. In a sense, this current achievement encourages griefing.

Possible Solution
Alter this achievement to something else like, “Defend X amount of towers, keeps, or castles.” While it does not address the problem completely, (because repairing a wall or gate, while the structure is contested, counts towards the defense of that structure) it would be far less encouraging for players to take supplies from structures than the current achievement.