master achievements..
press h for your hero panel then look for the story part in your hero panel an that’s where you find the master achievements
darres.8203, I know this is 5 months after the fact but in-case anyone else looks here is the answer. Master Achievements are awarded by completing special items within an episode for example “Do not take any static damage during last fight” or "Kill all attackers including traps and ambushes. Upon successful completion of all required you will be awarded the Master achievement reward listed. If you click on the Master achievement awards in the description it will take you to the list of what needs done for that specific reward. Hope this helps.
To add to that for possible readers in need, the achieves are greyed out until you have done the chapter once. Then you can repeat the chapter on the same alt and get the achieves; generally you can pick specific parts of the chapter to work on without having to do the whole thing.
Each alt you want available for achieves has to do the base chapter first.
You can pop up the mastery achievments for the episode in question by clicking the header.
Mastry achievements are avaliable once that character has completed the episode, and like all achievements are account based.
In addition, when re playing any episode you’ll see three gold crown icons in your buff monitor, one for each achievement you haven’t finished yet. Mousing over them will tell you what you need to do to unlock the achievement.
Each achievement has its own loot chest, and if you achieve complete mastry of an episode it grants you the mastry chest, which is a piece of ascended jewelry.
Think of them like secondary objectives from GW1. They’re things to give interesting replay value to the missions and add optional challenge with associated rewards for people who are willing to tackle them.
Writer/Director – Quaggan Quest
https://www.youtube.com/watch?v=ky2TGPmMPeQ