Here is the full list of all 45 Happy Feet Two: The Video Game achievements worth 1,000 gamerscore.
Assemble a group of 3 penguins
Assemble a group of 5 penguins
Complete a level
Complete a level with full health
Clap 108 times
Win your first Race
Collect 100 Black Music Notes
Fill the boost bar in a Race
Jump off three stunt ramps in a Race
Beat a Boss without making a mistake in co-op
Collect a Disco Fish
Beat a Boss without making a mistake
Wake up five Sleepy Penguins
Collect 200 black notes in one level
Collect the most notes in a Bonus Level in co-op
Revisit a previously played level
Smash three Ice Boulders at the same time
Destroy 10 objects during Disco Fish mode
Move five Ice Slide Blocks
Complete Emperor Land
Collect 2000 Black Notes
Perfectly perform a Dance Combo and a Stomp Combo in quick succession
Smash five Stone Columns
Convert 3 Penguins at the same time
Activate 20 moving platforms
Complete Adelie Land
Scare 20 Skua Birds
Complete five levels with every penguin in the level
Cross 50 Ice Rails
Complete Level 28 without getting hurt
Win every Race
Complete Elephant Seal Land
Complete the game
Complete an entire game in Co-Op
Complete the last level of a Land with full health
Bring 200 friends to the Doomberg
Defeat every Boss without making a mistake
Stay on the beat for 20 beats
Switch control between characters
Complete three stunt hoops in a single Race
Complete a Race without hitting anything
Unlock all songs
Activate all the Vibes in one Level
Level up all songs
Hit every stunt hoop in a Race