Here is the full list of all 22 Ookibloks achievements.
Clear Chokki Beach
Clear the Hermit in Chokki Beach stage 3!
Complete a single daily challenge
Win three prizes in one game of Ooki Balls
Earn an 'S' rank
Get the maximum chain possible on Chokki Beach stage 5
Clear Hole in the Ground stage 2 without breaking the rock blocks
Clear out all of the enemies in Hole in the Ground stage 6
Clear Twinkle Bay stage 5 while only defeating two enemies
Clear all the enemies in Twinkle Bay stage 7
Clear Mount DoodeeDoo stage 1 while only destroying three rock blocks
Clear Mount DooDeeDoo stage 2 without defeating the burning mushroom
Get a perfect combo on Myoo stage 1
Clear all the enemies in Myoo stage 3
Clear Mantangogo stage 1 without defeating any enemies
Get a perfect combo on Matangogo stage 3
Clear Lake ChiriChiri stage 6 with only two water changes
Clear all of the hermits in Lake ChiriChiri stage 4
Defeat the ghost kitty in stage 5 of the Frozen Wastes
Clear Frozen Wastes stage 9 in under 40 seconds
Clear Hani Hallow stage 3 with a perfect combo
Clear Hani Hallow stage 7 without defeating any enemies