Easy kills:When you rapidly press X to perform a four or five hit combo, press X slow enough to jab, but not too fast to trigger the combo. This causes the thug to fall into a repeating animation leaving him completely vulnerable without the ability to attack you.Achievements:ACHIEVEMENT – HOW TO UNLOCKPipe Wielder (5 points) – Wield the pipe in single-player or co-op mode.Knife Wielder (5 points) – Wield the knife in single player or co-op mode.Psycho (15 points) – Kill 10 enemies without losing your weapon.Perfect Boss (10 points) – Defeat the first boss without dying.Fourth Boss (10 points) – Defeat the fourth boss.First Versus (10 points) – Defeat another player on Xbox Live in a versus match.Online Warrior (5 points) – Defeat 10 opponents on Xbox Live in versus mode.Online Co-op (10 points) – Beat an online co-op game.High Score (25 points) – Score 800,000 points in one game with Game Settings set to Hardcore.Kill Jet (30 points) – Defeat the Boss “Jet” at the end of Stage 2 with Game Settings set to Hardcore.Hard Win (35 points) – Beat the game without using a special attack.Perfect Win (40 points) – Beat the game without continuing.