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