Here is the full list of all 21 TaniNani achievements.
Grab all crystals in World 1
Grab all crystals in World 2
Grab all crystals in World 3
Grab all crystals in World 4
Grab all crystals in World 5
Grab all crystals in World 6
Grab all crystals in World 7
Grab all crystals in World 8
Grab all crystals in World 9
Grab all crystals in World 10
Complete all challenges in World 1
Complete all challenges in World 2
Complete all challenges in World 3
Complete all challenges in World 4
Complete all challenges in World 5
Complete all challenges in World 6
Complete all challenges in World 7
Complete all challenges in World 8
Complete all challenges in World 9
Complete all challenges in World 10
Collect all crystals and complete all challenges