All Seeing Eye: It wasn’t that difficult, took me like 4? tries at Hoard 100. Sadly, TimeKnight did his at 111 (no shame to that actually), but doesn’t qualify for this topic. No screenshot available.
Hall of Guardians: Delves: Strategies, tactics and tips - #617 by TimeKnight
Crypt Keepers: Delves: Strategies, tactics and tips - #731 by jzg
Sea of Sorrow: A few people have done it, myself included, but no screenshot available. (Its only 200 after all)
Primal Rift: Highest possible Factions without going over 100 (Price is Right rules) - #3 by Shimrra
The Warrens: Delves: Strategies, tactics and tips - #886 by TimeKnight
Fang Moor: Delves: Strategies, tactics and tips - #921 by TimeKnight