# Attack her from far away

"You enemies of Babylon, attack her from far away"

# Open her granaries

"Raid the places where her treasures are stored"

# granaries

buildings where grain is stored

# pile her up like heaps of grain

Possible meanings are: reduce the city to piles of rubble that look like stacks of grain or stack up the plunder from the city like piles of grain.

# Set her apart for destruction

"destroy her completely". See Jeremiah 25:9.

# Leave no remnant of her

"Kill every person in her"