Kima & Co
No Gift of Exploration...
Assuming it’s not patch related, try the tips in the bug section of the wiki page “Map completion”
Bugs:
- Some players reported that they did not receive the reward when they obtained the world completion achievement. For some, revisiting the Chantry of Secrets resolved the issue. A few were able to work around the issue by revisiting every map on the required list. Another fix is to go through the Asura gate in Lions Arch to Black Citadel. If you encounter this issue and are not able to fix it on your own, you will have to contact ArenaNet support.
- If a character has attained map completion for a zone, and that zone at a later date has new items added, those new items need to be discovered in order to unlock the world completion medal and achievement, but not in order to get the world completion reward chest.