Here is the full list of all 21 SHINOBI NON GRATA achievements.
Defeat Kiganbo
Defeat O-Mukade
Defeat Kibachi
Defeat Shiryou Musha
Defeat Nue
Defeat Zangetsu
Defeat Mukuro Tenzen
Defeat True Mukuro Tenzen
Defeat Ennosuke Tamaki
Defeat Agito
Defeat Sesshouseki
Defeat Gomanda
Defeat Onmyo Houshi
Defeat Kubinashi Musha
Defeat Kanibouzu
Defeat Karakuri Type 7
Defeat Joro Gumo
Defeat Oni Agito
Defeat Genba Kisaragi
Defeat Mariya Kannon
Save Tsumuji