The achievement is self-explanatory,but if you want a boost strategy,here it goes:
I got it while farming itens for beat the nightmare train level.Just load the Millenium Tower stage on hard difficult and start killing all enemies.Yeah,it's a bit tought but you can die and reload as many times you want until the achievement pops.
One tactic is to block a lot and land some low kick attacks,and collect the enemies loot.If you do this continuously,when you open the rank S chest the achievement will automatically appears.
OBSERVATION: you can equip itens to your character that boost the chance to drop better itens from enemies.
If you preffer visual help,here it is an youtube video guide made by TrophyHunters79: