Jumping Puzzle Completion
The borderlands are supposed to be on a rotation, so you can get the achievement if/when it ever comes back
Levi Ironhart, Cassandra Irehart, Lucio Trothart
Discord Gearhart, Naevius Soulhart, Frisk Softhart
I expect Anet to move that achievement to Historic section before they bring back any of those old BL maps.
Only two Jumping Puzzles award a Mastery Point, that I know of:
‘Hidden Garden’ and ‘Retrospective Runaround’.
http://wiki.guildwars2.com/wiki/Mastery_point_unlocks
I don’t believe there is even an Achievement for doing all the Jumping Puzzles. Perhaps you are confusing ‘Dive Master’ with this activity for being able to acquire a Mastery Point.
http://wiki.guildwars2.com/wiki/Explorer
Good luck.
How can I fix this?
You can’t. The sanctum achievements aren’t currently possible and won’t be for the foreseeable future.
Is the Completion still valid if I get all Achievements except this one?
There is no specific achievement nor mastery for completing all JPs in the game. (Some JPs aren’t even on the achievement list, depending on what you call a ‘jumping puzzle’.)
And if not, why don’t they move the Achievement to the History-tab?
Good question. Probably due to ANet Consistency™
The jumping puzzles in the old WvW borderlands maps don’t award any mastery points, so you don’t have to worry about missing any. You can check the achievements yourself in the achievement panel. Achievements that award a Tyria mastery point have a red star like symbol as part of the reward for completing it, and a green star like symbol for HoT mastery points.