Here is the full list of all 13 Rangi achievements.
Complete the world of Sauti
Finish level 19
Finish level 17
Complete the world of Muziki
Finish level 11
Finish level 8
Finish level 7
Connect your first color line
Meet the Muziki Giant
Collect all pieces of Tambo artifacts
Collect all pieces of Kuru artifacts
Collect all pieces of Kuficha artifacts
Collect all artifacts