Since the achievements in Skullgirls don't out-right tell you what you have to do, some of them can be a little hard to understand.

For this achievement, you must use Peacock's special move Shadow of Impending Doom to drop every item this move can drop on an opponent.

DO NOT TRY THIS ACHIEVEMENT IN TRAINING MODE! IT WILL NOT UNLOCK!

To set up for this achievement, the best way is to go into a local versus game, and pick the following set up:

Player 1: 3 characters

Player 2: 1 character

This will mean that you do less damage to player 2, and thus be able to get more drops in a match.

Please also note that this achievement IS a cumulative achievement, meaning that you do not have to get all these drops in the same match.

Okay, so now that the match is set-up, we can start getting these drops.

The input for Shadow of Impending Doom is: QUARTER CIRCLE BACKWARDS + PUNCH.

Input the move correctly and you will see a shadow appear on the ground, followed by a random item falling.

There are 3 different levels of this move, depending on how long you hold the punch button down for:

Level 1 = Just tap punch.

Level 2 = Hold punch down until an exclamation mark appear on the shadow, then let go.

Level 3 = Hold punch down until the item falls.

Level 1:
Plant Pot
Fish
Boot
Bowling Ball
Tea Cup
Sand Bag
Bottle

Level 2:
Safe
Spiked Ball
Kitchen Sink
TV With Avery the Parrot
TV With wierd face AKA (Nico Nico logo)
TV With Woman falling out (Sadako Yamamura from the Ring)
Andy Anvil
The Wieght with a face guy (Tommy Ten Tons)
Oil Drum
Oversized Ms Fortune Head (Yukkuri ♥♥♥♥♥♥♥♥♥ ne! Ms Fortune)

Level 3:
Steamroller
Piano
Fridge
Elephant
Wieght + Spiked Balls (Tenraiha)
Easter Island Head

You may want to copy and paste this list into notepad or something and delete them when they drop for you to keep track.

Some of these drops are rarer than others, so this achievement may take some time (took me about 20 mins).

Hope this guide helps! Happy dropping!
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Special thanks to the following users who helped me out with some of the drop references:
Lady Tomoko
RikersSama