Tekken 6

This achievement is obtained by quickly defeating 10 enemies in a row in a chain attack by either you or your partner. Breaking boxes can also increase the counter by 1. The chain is shown on the left of the screen when 2 or more enemies have been defeated in quick succession - simply hit 10 and it will appear. You can get this quite early on in the Campaign.

quite easy to get, during scenario mode you you find weapons you can pick-up, i find the machine/Gatling gun works best, just find a area with a bunch of crates/enemies and shoot like crazy, you know the saying "spray n pray"