Achievements:ACHIEVEMENT – HOW TO UNLOCKReady 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.