Blind Lake Sturgeon Angler

Before heading out, equip a fishing pole such as the Ephemeral Fishing Pole, Arcanite Fishing Pole, or Mastercraft Kalu'ak Fishing Pole, and add a fishing line like High Test Eternium Fishing Line, Rook's Lucky Fishin' Line, or Reinforced Fishing Line — these work like enchants and stack with lures such as Worm Supreme or Heat-Treated Spinning Lure. You can further boost your skill with Hightfish Cap or Tentacled Hat, Boots of the Bay or Nat Pagle's Extreme Anglin' Boots, and Formula: Enchant Gloves - Angler or Formula: Enchant Gloves - Fishing, with all bonuses combined reaching up to 425 additional fishing skill.

Head to Shadowmoon Valley and stand on the rock jutting out of the water at 41, 48 — you only catch Blind Lake Sturgeon here, no bait is needed, and approximately one third of catches will be the Enormous Blind Lake Sturgeon required for the achievement, with all 100 catches typically taking around 30 minutes.

Alternatively, fish at 57, 64 in Shadowmoon Valley, just above the waterfall south-southeast of the Draakorium flight point, where the Enormous Blind Lake Sturgeon drop rate has been observed to be significantly higher than the lake below — cast between the waterfall and the bluish rock without moving or changing direction between casts.