Full list of all 26 Kao the Kangaroo achievements.
The base game contains 15 achievements, and there is 1 DLC pack containing 11 achievements.
Finish the game
Defeat the Jayabaya
Defeat the Oldest One
Beat the Eternal Warrior
Collect KAO letters on all Levels
Unlock all extra heart slots
Collect all Kaopedia entries about Foes
Collect All Eternal Runes
Defeat one of the Bosses without receiving any damage
Find and complete all of the Eternal Wells
Have 20 lives in total
Defeat 5 enemies at once with finisher
Wear an outfit from Kao 3
Find and defeat the Terror
Complete a tutorial with Walt
Complete Waterfall Islands (Easy Mode)
Complete Waterfall Islands (Hard Mode)
Complete Volcano Peaks (Easy Mode)
Complete Volcano Peaks (Hard Mode)
Complete Forsaken Monastery (Easy Mode)
Complete Forsaken Monastery (Hard Mode)
Complete Twisted Hideout (Easy Mode)
Complete Twisted Hideout (Hard Mode)
Defeat the Crab King
Collect every diamond in the Bend the Roo'les
Find the Frozen Pirate from Kao 2