What's the difference with the Premium version?
MythicAchievements Premium allows you to create an infinite number of categories (tabs) and achievements. The free version allows a maximum of 2 categories and 10 achievements, and is meant for demoing the plugin.
What version of Mythic is needed?
MythicAchievements should work with all versions past Mythic v5.1.2, and should always work with the free version. Mythic Premium is not required.
Why does my client freeze when reloading?
Sometimes Minecraft will freeze for a couple seconds for all online players when running
/mythicachievements reload. This is because the server is deploying an updated datapack, and the freezing is the client "reloading" the datapack similar to a resource pack.
For this reason we recommend not working on adding new achievements on a live production server with players online.