First of all, achievements "uncompleting" is definitely a bug, and shouldn't be happening. I will look into this.
Regarding the Master decoration levels (and the Forsaken Masters achievement), we intentionally pitched these to not be too difficult, in terms of time-to-grind. This is why you don't need to fully complete anything to reach level 7 for them:
- Zana level 7 only requires you to complete 120/159ish maps on the Atlas.
- Einhar level 7 only requires capturing 160/270ish different monsters in the Bestiary.
- Niko level 7 only requires delving to a depth 200, compared to 600 for the achievement in Delve League.
- Alva level 7 only requires 70/73 rooms explored in the Temple.
- Jun level 7 only requires 50/57 ranks defeated.
For clarity, Alva and Jun are not quite as straight-forward as the others, and worth elaborating on.
For Alva, there are 24 types of rooms each with 3 tiers, plus the Apex. Th...
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