Unlock the following Avatar Awards by performing the corresponding tasks:

AVATAR AWARD - HOW TO UNLOCK
Healer's Mask - Complete all four levels in the Trial Realm.
Fireling's Mask - Revive the ancient One after completing all levels.

ACHIEVEMENT - HOW TO UNLOCK
Long Live Chief Berni-ni (5 points) - Revive the Fire Chief, Berni-ni.
A Shocking Development (10 points) - Use the Harvest Chief, Diggi-dodo's power on a Booli.
Sober the Stinkers (15 points) - Get the stinkers off slugs.
Abracadabra, Alakazam! (20 points) - Transform a Booli using the Animal Chief, Ali-mali.
Flotsam and Jetsam (25 points) - Completely flood a level using the Swimmer Chief, Fini-ni.
The Way the Booli Crumbles (30 points) - Shatter a Booli into pieces using the Stone Chief, Te-tera.
Dibs on the Drumstick (35 points) - Make a feast for the flappers.
And Stay Out! (10 points) - Kick the Boolis out of Ooga.
Taste Tester (5 points) - Swallow 15 unique items.
Death Defier (5 points) - Complete 22 levels without dying.
Bone Collection (35 points) - Collect all of the bones of the Ancient One.
Join the Revolt (5 points) - Complete a split screen cooperative level.

"The Forgotten Chapters" achievements
ACHIEVEMENT - HOW TO UNLOCK
Comrade Crate (15 points) - Open the crate to discover the contents. You monster.
Super Spear Hero (15 points) - Kill the baddest tuska in all the land.
The New Boss (20 points) - Get the Glow Stone.