Dragon Age: Origins

Kinslayer - 10G - Completed the Dwarf Noble origin story

For this origin story the only enemies you will be fighting are darkspawn and some dwarves.

After you watch/fight in the Provings your brother Bhelen will tell you that your brother Trian is plotting against you to kill you.

Go back to your father and he tells you to find the shield of your ancestors in a tomb in Aeducan Thaig in the deep roads and after you fight your way through Aeducan Thaig you will be in a room with a sarcophagus and 3 tiles in the floor and when you stand on them it presses down, put all 3 of the guards on the slabs and use your signet ring on the sarcophagus you will gain access to the shield.

Then once you get out of the tomb put some rounds in the Balista a bit to the east of the entrance to the tomb you will knock a quicker way through and you will end up fighting your brother Trian and the only outcome is you kill him and Bhelen framed you like the evil scheming git he is and the guards are working for him and they say you did it even though you did but Bhelen set it up too good.

You lose your royalty, you end up losing your noble rights and sentenced to fight darkspawn in the deep roads until you die (or so they like to think) and become casteless for killing your brother (what a great set of siblings I bet King Aeducan's so proud of them).

Fight your way through the darkspawn to the grey wardens and Duncan will then offer you the chance to become a grey warden, accept, once the cutscene is over on the loading screen to Ostagar you should get the achievement.