When I completed these Achievements (to get Red Flying Cloud Mount), the Lorewalkers Reputation will reach Exalted.
Actually It was not.
This is a quote from the source:
Gaining reputation with The Lorewalkers is an unusual process. Instead of completing dailies or zone quests like most other Pandaren factions, players gain reputation by visiting monuments, completing achievements, and hearing folktales. If you have an organized path in mind, hitting Exalted should only take a few hours with a flying mount!