ACHIEVEMENT - HOW TO UNLOCK Ready to rock (5 points) - Clear the first level. Stabilized (15 points) - Get all medals in any level. All powered up (15 points) - Have all 4 power-ups at the same time. The Per Lundberg syndrome (30 points) - Get 100% of all medals. Hard as Rock (25 points) - Complete the game on Hard difficulty. Ambitiously ambidextrous (15 points) - Clear at least 3 levels with all 3 controller types. Bubbler of the week (15 points) - Get 10 enemies within the same bubble. Skull and crushed bones (15 points) - Crush 10 skulls without touching the ground. Given to wail (20 points) - Clear all levels using a guitar. Firewalker (15 points) - Defeat 100 enemies using the Fire Boots. Incognito (25 points) - In single player, clear each standard level collecting less than 20 points. Best friends forever (5 points) - Revive another player 10 times in co-op.