Here is the full list of all 13 Bumbledore achievements.
Destroy 5000 Fireflies
Destroy 5000 Ants
Destroy 5000 Berserkers
Destroy 5000 Mantises
Destroy 5000 Rhinos
Destroy 5000 Ice Bugs
Heroic clear all levels in Pollanor Palace
3-honeycomb complete all levels in Pollanor Palace
3-honeycomb complete all levels in Wintrus Citadel
Heroic clear all levels in Wintrus Citadel
Heroic clear all levels in Honeyhold Keep
3-honeycomb complete all levels in Honeyhold Keep
Destroy 5000 Wasps