This achievement must be done in a multiplayer (local or online) game of Soul King. Create a match with 5 rounds and a 5 minute time limit. Kill everything you come across and collect all the souls that get left behind. This achievement is infinitely easier when set to local multiplayer with an empty second controller. The game requires at least two players to earn enough souls for the score and with an empty controller you have no competition. Earn 25,000 souls by the end of the fifth round and this achievement will pop.