Here is the full list of all 20 Rivais Em Batalha achievements.
Score 1 point and become Private
Score 50 points and become corporal
Score 100 points and become Third Sergeant
Score 150 points and become Second Sergeant
Score 200 points and become First Sergeant
Score 250 points and become SubLieutenant
Score 300 points and become Aspirant Officer
Score 350 points and become Second Lieutenant
Score 400 points and become First Lieutenant
Score 500 points and become Captain
Score 600 points and become Major
Score 700 points and become Lieutenant Colonel
Score 800 points and become Colonel
Score 900 points and become Brigade General
Score 1050 points and become Divisional General
Score 1200 points and become Army General
Score 1500 points and become Marshal
Kill 200 galliformes and become King of the Hunt
Kill 200 foxes and become King of the Chicken Coop
Completed training mode.