Here is the full list of all 14 It's Raining Fists and Metal achievements.
Complete Michael Stoner's Adventure
Complete Lady Metal's Adventure
Complete Thrash Austin's Adventure
Complete Rolling Ton's Adventure
Complete Vegard Doom's Adventure
Complete Steppen Joe's Adventure
Play a 4 players game
Win a match versus an AI without falling from the stage
Enter the tutorial room
Drink 20 beers
Kill 3 opponents during the final attack
Win 10 concerts at EASY
Win 10 concerts at NORMAL
Win 10 concerts at HARD